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BIOS doesn't detect hard drive

By paul_won9 ·
Recently, my computer power supply fan wasn't working properly, so replace the power supply. After I replaced it and turned on the computer, it asked for boot media and some sort, so i look in the bios and it showed it didn't detect the hard drive. I don't have a boot disk. Is there a way to fix this?

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by BFilmFan In reply to BIOS doesn't detect hard ...

Set the BIOS to autodetect the hard disk.

If you had a bad power supply, you may well have lost the system board also.

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by HAL 9000 Moderator In reply to BIOS doesn't detect hard ...

Well since you can get into BIOS at least the M'Board id plugged in but the HDD might not be and even if the connector is in the socket on the HDD. These can only go in one way and sometimes they can be tight so while you do not want to force it you do need to be firm when plugging it in.

Are you seeing the CD/DVD ROM Drive in BIOS?

How many plugs are attached to the M'Board there should be at least 1 X 20 pin connector and maybe a 4 pin connector as well are both of these plugged in?

You also need to check the Data Lead to the HDD at both ends the one in the Drive itself and at the other end on the M'Board if these where removed where they put back in properly? There is a red strip down one side and that always goes to Pin 1 on each connector. Now Pin 1 on the HDD is the end closest to the power connector but on the M'Board you'll have to look either in the Manual or on the M'Board itself or maybe sometimes on a sticker on the inside of the case.

Leave the cover off and start up the computer and check if the fans are running particularly the one on the CPU. If this is running most likely the M'Board is OK as the Power supply relies on a signal from the M'Board to keep running so if it keeps running at the very least part of it is working.

If after making sure that the HDD has the power plug plugged in properly and the DATA lead properly installed you still do not get a HDD shown in the BIOS try removing the HDD from that unit and fit it to another computer to see if it is still working. It is possible that the power supply became very hot and unstable and caused the + or - 5 & 12 Volt DC rails to go out and have damaged the drive or the IDE controller on the M'Board. If you can see a CD/DVD ROM the latter isn't likely, but really it all depends on the quality of the original Power Supply as if it was a cheap one almost anything is possible.

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by HAL 9000 Moderator In reply to

If the HDD works or is seen in another computer as you really are only interested in making sure that it is still working install it back in the original computer and clear the BIOS. This can be achieved by changing a jumper plug or removing the battery but if you have to remove the battery make sure to remove the power lead and leave the unit alone for at least 5 minutes without power or a battery before you reinstall the battery. You'll then have to go through the BIOS setup again but all you should need in input is the Date, Time and Floppy Drive if fitted the computer should work with the Defaults from there on in. If you can not still see the HDD change the Data lead with a known good one and then if that doesn't work you're looking at a replacement M'Board.Of course if you have a SATA most likely BIOS will not be seeing it as these generally do not appear in the BIOS and require a driver to make them work which could be a problem for you without the disks that came with the computer originally.

Col

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by HAL 9000 Moderator In reply to

OK I got your e-mail when you replace a PS you not only unplug the M'Board but every device in the computer that draws power from the PS. As you have this HDD in a removable caddy it may not have been reconnected or it may remain unlocked which will stop it being seen by BIOS.

Now depending on the caddy there could be either a key or a tab that you push across to lock/unlock it. In the unlocked position there is no power to the HDD and it is removable in the locked position it has power and you can not remove the drive without breaking something. If you can not easily move the lock the most likely thing is that the caddy is not in the carrier properly so if it was unlocked when you changed the PS it most likely has slipped out a bit . Just pull out the caddy and re seat it in the mount and then lock it up again. Because these are not Hot Swappable you'll need to do this with the computer turned off but not necessary with the power removed.

If the drive still is not being seen in BIOS you'll need to remove the drive from the caddy and check that it is still connected properly. Some of the plugs used to plug into the data connection are a bit big and do work their way out slightly and prevent the drive being recognized as there is only a solid power connection to the HDD but no data line connection.

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by HAL 9000 Moderator In reply to

If that doesn't work remove the drive from the caddy and plug it into the connectors that go to the caddy if BIOS can see it then you have a problem with the removable caddy which just may be something unrelated to the PS or it could be that because the PS was not working properly the 5 VDC rail has managed to go low and erase the MBR File Table depending on the format of the drive, but even then it should still be seen about the only thing that I can think of is that the interface circuitry in the caddy has been adversely affected by the PS going off so remove the drive from the caddy and plug it straight into the IDE Lead and Power Connector and then see if it is visible in BIOS. If it is refit it to the caddy and try again if it now works just go on if it doesn't work you'll have to replace the caddy.

Col

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by Maggot In reply to BIOS doesn't detect hard ...

All the above aside, there is the remote chance that the new power supply is no good as well.

This has happened to me before. I bought a new supply, installed it and the machine wouldn't boot. I returned it for a different one and it worked. These were not cheap power supplies either, they were in the $70-80.00 range.

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