Resolved Question

Desktop: Fans and LED lights work, but no signal to monitor.

I'm trying out my first build using parts from two computers that stopped working. (I assume due to a virus or corrupted system/boot files) Both desktops originally would simply black screen after booting and loading windows, but the monitor was still getting a signal. I opened up an external hard drive and used its adapter to get a recovery file to try to restart the computer. After it finished copying to my laptop, it had the same problem. I formatted the hard drives with the problem and put them back in the PC. I got a windows 10 iso and booted the computer fine it then went to a windows download prompt. I had to go to work for a few hours before configuring. When I came back I moved the desktop into my room and now it starts up and runs the fans and LED lights, but nothing else happens.

Troubleshooting I've done so far:
Cleaned out the graphics card, the entire case and the mb with pressurized air.

Changed the ram sticks (all four at a time)

Reseated everything

Swapped graphics cards

Reset the BIOS (by reseating the battery, using the jumper pins, and pressing the CMOS reset button on the mb with that option)

Swapped out the internal hard drives

Tried different outlets
Tried different cables, different video connections on desktops and different inputs on multiple monitors. (All monitors are working with other computers)

I have tried two separate PSUs, at least one was working before this problem. I have also tried two separate mother boards.

Thank you for taking time to read all of this. If you have any ideas or general tips please let me know.

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Reply to: Desktop: Fans and LED lights work, but no signal to monitor.
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Best Answer

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Too far gone

The computers I'm trying to repair are just too far gone from over a year outside in a shed providing very little protection from the elements. I'm gonna buy new parts and make a PC with those and the few things I can salvage.

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There are some mis steps there.

When I go to install Windows I no longer format the drive. Yes I did that for Windows 3.x and prior but today we use a blank, unpartitioned drive. The Windows installer since about Windows NT and XP will install to a blank drive taking care of partitions and more.

There's another issue. I can't tell if the BIOS shows up. If the PC doesn't show the BIOS screen this is a dead PC and not an install or settings issue.

Tell the story again and see I can follow your steps.

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What do you mean by a dead computer? Do I need to replace the mb?

There isn't any signal coming from the pc at all. So no BIOS screen, no boot screen, not even a real black screen. Just no signal at all. I've checked all the monitors I've tried and all the cables save for the DVI cable because I don't have anything else with DVI.

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Also, I formatted the drives to wipe the bad files off from the previous computers. They weren't dead because it would go all the way to the Windows logo before the black screen and I'd still see a cursor.
Regardless of the hardware issues, if I'm going to install Windows 10 do I need to put different settings on the hard drive I install it on?

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At this point, try it.

My view is I don't format drives prior to the OS install. I will give the Windows installer BLANK drives. That means no partitions.

I think it's best folk learn this first hand. Some don't believe it and have to try it to learn what does and does not work.

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Make it smaller

If you swapped mobo's between cases did you pay attention to the stand offs under the mobo?

No extra's allowed.

If your not getting anything to the monitor then forget the OS.

Unplug the hdd.
Connect the monitor to the mobo if possible and remove the graphics card.
Remove the ram.

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