Windows 10: No BIOS Post and Blank Screen

If the drive is no longer connected to the suspect PC and the suspect PC still refuses to boot/post then the HDD isnt the issue I would say. Does sound like a MOBO issue tho *Smile

 

The PSU can be a problem if the power on hand shaking signals do not work correctly as I said in my previous post.

 

C'mon guys....

The OP should at least get a boot screen. That even if there is no hard drive installed, the OP should still get a boot screen saying "not boot drive found" or something like that on the screen. The fact that there is NOTHING on the screen either says monitor or GPU problem.

Maybe I'm missing something but I think that should be solved first!

@ the OP, did you check the monitor is working properly? If you've got access to a different monitor, can you try in on the PC first? If the monitor is good, than the next step is the video card.

Can't check Device Manager or anything else requiring a screen if there's no video.

 

Ah, I do believe the full sized desktop drives need 12 V and 5 V. That USB adapter will only supply 5V. I wouldn't throw it away just yet.

 

Check device manager on the PC that the drive is connected to via the USB Adapter. I think we already figured out why it doesn't work though. He needs ad adapter with its own external power supply.

 

*Ditto To figuring out why it won't POST. I do believe its an all in one. You could try an external monitor, not sure that will help though? I think the issue is deeper than that. If the video card has failed it won't make any difference. No beep codes isn't a good thing. That's about as bad as it gets.

 

I keep mentioning the PSU which has to send/receive the correct handshaking signals to/from the motherboard to power on. Has the PSU operation been tested? The PSU may be 'receiving power' but that doesn't mean it is turning on to output the various voltage rails to the motherboard. A failed PSU or a PSU having a failed +5V standby circuit would give the symptoms reported.

 

OK, I'm going to close this thread. Many thanks for all your help/suggestions. Just a couple of things to mention. The desktop drive I tried to test using the USB adapter - it does need an external power supply and I didn't know that at the time. I did connect it to my desktop using the internal connectors and still could not read the disk so that pretty much tells me the disk is one problem. Regarding the blank screen, as one of you said, it's either the mobo or video. In this all-in-one, I believe the video is integrated with the processor as I have taken the thing apart and cannot spot any separate video card. I didn't mention this before but I am trying to fix this computer for a friend and, since I don't have all the electronic gizmos that repair shops have, I can't nail down the specific problem and, as a result, I've told her that it's not worth fixing. It's close on 10 years old and new or even used mobos don't seem to be available in the UK and if it's the video, then a new processor is required. More expense than it's worth. Having said all that, I've learned a lot from your posts and for that I'm grateful. Thank you all very much.