When the computer is booted, if the previous boot failed during POST, Fast Boot is disabled and the following message displays: The previous boot attempt failed. Would you like to restore Fast Boot on the next boot? If the boot attempt fails after POST, no message displays, and Fast Boot is still active. Power button recovery. If the drive in question has failed but is connected to the PC (so don't pull any cables out before you check) then you'll see a none message next to it here. In my case, the system menu in my.
The POST (power on self-test) is a set of procedures that a computer runs through each time it is turned on. It ensures that all of the system's hardware is working properly before trying to load the operating system. If the computer does not pass POST, it will not boot.
If you're experiencing POST errors when you boot your computer, the following steps may help you fix the problem.
TipMake sure the computer turns on. If nothing happens (no lights, no sound, no fans, etc.), see: Why won't my computer turn on?
CautionSome of the steps below recommend removing physical parts from inside the computer. While working inside the computer, it's highly recommended you be aware of ESD (electrostatic discharge) and its potential hazards.
Remove new hardware
If any new hardware was recently added to the computer, remove that hardware to make sure it is not causing your issue. If your computer works after removing the new hardware, it can mean a few things. Either the new hardware is not compatible with your computer, a system setting needs to be changed, or the new hardware is defective.
Remove any disks or USB devices
Remove any disks, CDs, or DVDs that are in the computer. If any USB devices (iPods, drives, phones, etc.) are connected, disconnect all of them as well. Reboot the computer and see if anything changes.
Disconnect external devices
Remove everything from the back of the computer, except the power cable. Turn on the computer and see if it beeps normally. If the computer has never beeped, keep the monitor or display connected to see if any change occurs.
Reconnect and check power cords
If the computer is not getting enough power or the power is getting interrupted, the computer can encounter problems. Disconnect your power cables from any power strip or UPS (uninterruptible power supply) and connect the computer directly to a known good wall outlet.
Identify beep code
If you are receiving a sequence of beeps, see the beep code page for a listing of different beep codes and their explanation. You can also check your motherboard or computer documentation for information on the beep codes. These beep codes are meant to help identify which computer component is failing or bad. If your beep code is not listed, continue troubleshooting.
Check all fans
Make sure all fans are running on the computer. If a fan has failed (especially the heat sink fan for the CPU), your computer could be overheating or detecting the fan failure, causing the computer not to boot.
Check all cables
Verify all the cables are securely connected to the computer and that there are no loose cables by firmly pressing in each cable.
- All disk drives should have a data cable and power cable connected to them.
- Your power supply should have at least one cable going to the motherboard. Many motherboards may also have additional cables connected to them to supply power to the fans.
Disconnect all expansion cards
If the above recommendations still have not resolved the irregular POST, disconnect the riser board (if applicable) and each of the expansion cards. If this fixes the problem or allows the computer to POST, connect one card at a time until you determine which card is causing the problem.
Disconnect all drives
If you cannot diagnose the problem by the beep code (or you do not hear a beep code), power off the computer. Then, disconnect any IDE, SATA, SCSI, or other data cables from the motherboard. When they are disconnected, try booting the computer again.
If this resolves your irregular POST or generates error messages, reconnect each device until you determine which device or cable is causing the issue. In some situations, it can also be a loose cable connection that causes the issue.
Remove the RAM
If you continue to experience the same problem with all the above hardware removed, remove the RAM from the motherboard and turn on the computer. If the computer has a different beep code or was not beeping but is now, turn off your computer and try the suggestions below. Make sure to turn off the computer before adding and removing the memory and then turning it back on to see if the suggestion resolves the issue.
- Re-insert the memory into the same slot.
- If you have more than one stick of memory, remove all but one stick of memory and try rotating through each stick.
- Try one stick of memory in each slot.
If you can get the computer to boot with one or more of the sticks of memory installed, you are likely dealing with some bad memory. Try to identify which stick of memory is bad and replace it.
If you can get the memory to work in one slot but not another slot, the motherboard is likely defective. You can either workaround the issue by running the memory in a different slot that does work or replace the motherboard.
Power cycle the computer
In some situations, a computer may have power related issues often caused by either the power supply or the motherboard. To help determine if this is the issue, try turning the computer on, off, and back on as fast as possible, making sure the computer power light goes on and off. In some situations, you may get the computer to boot.
WarningTry this method only as a temporary workaround or as a last resort to get any valuable information from the computer.
Disconnect and reconnect the CPU
For users who're more comfortable working inside their computer, reseat the CPU by removing it and re-inserting it into the socket. You should also apply a fresh layer of thermal compound between the CPU and the heat sink.
Loose BIOS chip
If your motherboard has a BIOS chip, it can become loose over time due to heat expansion and cause the computer to give an irregular POST. Gently press down on the BIOS chip to make sure it has not become loose.
Bad motherboard, CPU, RAM, or power supply
If, after trying all of the above recommendations you still have an issue, you likely have a bad motherboard, power supply, CPU, or RAM stick. The next step would be either to replace these components or have the computer serviced. If you plan on doing the repairs yourself, we suggest you replace or swap in parts from another computer that is known to work. Replace the motherboard first, then the RAM, the CPU, and finally, the power supply.
Additional information
- See the POST definition for further information and related links.
Abruptly unplugging an external USB hard drive without safely ejecting will easily cause serious problems, such as the external hard drive not recognized anymore or hard drive becomes inaccessible after unplugging. In this post, you can find the best solutions to solve the unreadable, unrecognized or inaccessible hard drive issues with detailed troubleshooting steps, and also the data recovery solution to export data from an external hard drive that you cannot access right now after unplugging.
Solution: Reformat the corrupted external hard drive
If Disk Management fails to fixexternal hard drivenot recognized afteraccidental unpluggingonWindows, the last choice is to reformat the corruptedexternal hard drive. But reformatting will clean all data stored on theexternal hard drive. Here recommend you the EaseUS hard drive recovery software.
This post offers help for people who unplugged an external hard drive but later find that the drive is no longer recognized or detected by Windows, or Windows can still read the hard drive but asks you to format the disk before you can use it.
| Workable Solutions | Step-by-step Troubleshooting |
|---|---|
| Fix 1. Temporarily show up |
|
| Fix 2. Recover data from hard drive | When the hard drive is showing up again on your computer, download EaseUS hard drive recovery software...Full steps |
| Fix 3. Permanently fix the problem | You can make changes in the Registry to make your external hard drive appear properly...Full steps |
No matter which case could happen to you after inappropriately pulling a frequently used external hard drive out of the computer, it's not expected by us all. Usually, abruptly unplugging an external USB hard drive without safely ejecting will easily cause serious problems, such as the external hard drive not recognized anymore or hard drive becomes inaccessible after unplugging. On this page, you can find the best solutions to solve the unreadable, unrecognized or inaccessible hard drive issues with detailed troubleshooting steps, and also the data recovery solution to export data from an external hard drive that you cannot access right now after unplugging.
How to temporarily show up the external hard drive
It's because the upcoming two methods to make Windows detect your removable hard disk again is not 100% working for Windows recognizing the drive the next time you unplugged the drive and plug it again into the computer. You can take it as a temporary fix, for the purpose of extracting important data from there.
Method 1. Assign a drive letter to the drive
First of all, check if the drive is visible in the Disk Management or Device Manager.
To access the Disk Management: hit Start, in the run box, type diskmgmt.msc and hit Enter.
To access the Device Manager: hit Start, in the run box, type devmgmt.msc and hit Enter.
Good luck if the external hard drive is there. All you have to do to make it appear on your computer, follow the guide below.
Step 1. In the Disk Management, right-click the external hard drive (it shall be displayed as 'unallocated' state), and select 'Change Drive Letter and Paths' from the menu.
Step 2. Choose a drive letter that has been not used for the current drive, such as E, F, G... and click OK to save the change.
Method 2. Update or reinstall drivers
Step 1. Open Device Manager > Expand Universal Serial USB controllers.
Step 2. Locate and right-click on the external drive and select Update Driver Software.
Step 3. Select Search automatically for updated driver software and Windows will help you update the latest drivers automatically.
How to recover data from the external hard drive
As soon as the hard drive is showing up again on your computer, go directly to download EaseUS hard drive recovery software to export data from the hard drive to another safe location. Since the hard drive may have developed bad sectors or some other hardware issues after accidentally unplugging, you're recommended to do data recovery instead of data backup at this moment.
Step 1. Choose the external hard drive
Failed To Detect One Or More Drives During Postal
Since you're going to recover data from the external hard drive, run EaseUS Data Recovery Wizard and under the External Devices tab, choose the exact drive where you lost data. Click Scan.
Step 2. Scan for lost data
The software will start immediately to scan all over the selected drive for all lost data. During the scan, you could see more and more data showing up in the results.
Step 3. Preview and recover data
After the scan is over, check the scan results for the desired data. You can preview the file by double-clicking on it. Click Recover and choose another location to save the recovered data.
How to permanently fix the hard drive not recognized error after unplugging?
Welcome to the final part of troubleshooting an unrecognized external hard drive after unplugging due to improper removal from the computer. According to the feedbacks of people who were caught up in the same situation, by making changes in the Registry will help make your external hard drive appear properly on your computer and permanently solve the non-detection problem.
Step 1. Hit Start, type regedt32 and click OK.
Step 2. Backup your registry by going to file > export.
Step 3. On the left side, go to: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlClass{4D36E967-E325-11CE-BFC1-08002BE10318}.
Step 4. If you see any upper filter or lower filters at the right side, delete them.
People Also Ask
1. How to fix external hard drive not recognized after unplugging on Mac?
Chances are that frequently unplugging an external hard drive without properly ejecting will cause hard drive corruption, as a consequence, not recognized the next time you plugged it in the Mac. When a Mac drive isn't showing up as normal, try to change a connection cable or a USB port, and reboot your Mac for several times.
2. Why is my external hard drive not detected?
Most of the cases of an external hard drive being not detected by Windows, it's the fault of human errors or software/hardware corruption. When you cannot find the connected hard drive in Windows Explorer, try to verify if Disk Management can locate the hard drive and display it there. See how to fix external hard drive not detected.
3. Is it bad to unplug hard drive without ejecting?
Many people would argue that they didn't receive bad results as they always directly unplug a connected hard drive, USB flash drive or SD card from their computer. Surely, sometimes abruptly unplugging a drive without ejecting would not show some bad symptoms, but it's all about time. The more frequently you did that improper thing, the more likely your hard drive will get corrupted and damaged in the future.
4. How do I format my hard drive that doesn't show up?
Failed To Detect One Or More Drives During Posture
To format a hard drive that is not showing up, you should try to locate the drive in Windows Disk Management.
- In Windows 10. go to This PC - Manage - Disk Management
- In Windows 7, go to My Computer - Manage - Disk Management
Failed To Detect One Or More Drives During Posterior
Right-click on the hard drive partition and choose Format..., follow the format wizard to complete the formatting process.