When you manually short the power on jumper on mobo, nothing happens?

I'll need to check. I wasn't aware of that jumper

retardware wrote:

When you manually short the power on jumper on mobo, nothing happens?

I feel dumb for asking, but what are you referring to, exactly? I didn't see that jumper in the MB manual

Looks like a strange mobo. It has only a "sleep switch".
What happens if you short that one?

retardware wrote:

Looks like a strange mobo. It has only a "sleep switch".
What happens if you short that one?

Nothing. That's also where I think I had originally had the power switch connected

If it does not power up using another known-good PSU, I'd suspect the board needs repair.
Some really do not like being powered while CMOS power is shorted.
As this board is not really old, I'd consider replacing it.

But, maybe one of the repair gurus here is in the mood...

How many of the components can you replace for purposes of testing?

The "power jumper" is where the power switch plugs into the motherboard, BTW.

It's possible to repair almost anything, in theory, it's just whether it's worth it.

Eventually someone will tell you to check for bad caps, particularly power filter caps, though this can be hard to do. Often they bulge at the top, but not always. Some component or another could have been kicked over the edge from functional to non-functional during the problem.

Just to be sure, start off by testing the PSU: https://www.instructables.com/id/How-to-power … y-without-a-PC/

I recently had a "dead" motherboard (Socket 775) and later on discovered it was actually the 4 pin connector that powers the CPU that had a problem. Eventually turned out to be a capacitor and MOSFET around the CPU area (where it gets very hot) that had to be replaced.

Gazirra wrote:

I then tried to power up the system, and nothing happened.

Can you elaborate? What is "nothing", exactly? Did the PSU fan start and in general it looked like it's powering the mobo but there was only black screen, or was there no reaction to the switch at all?

If the PSU is working, check the voltage between the 2 pins that were shorted in oder to clear CMOS. Just be careful not to short them out again with probe leads.
On the other hand, if the PSU is not starting but otherwise checks OK with another mobo, then I'm afraid you've most likely burned out some copper on this one. Sometimes it can be repaired but the hard part is to actually find the fault - and it can be inside the PCB (inner layers).

I have AOpen AX6B and sometimes have problem booting it up - same effect - will not boot at all. The solution is to replug power supply - then it starts without a problem.

But before plugging it back again, just short ground with start pin to check is PSU actually starts.

I'd also remove battery for a while - don't suppose that would help, but won't hurt.

Deunan wrote:

Can you elaborate? What is "nothing", exactly? Did the PSU fan start and in general it looked like it's powering the mobo but th […]
Show full quote

Gazirra wrote:

I then tried to power up the system, and nothing happened.

Can you elaborate? What is "nothing", exactly? Did the PSU fan start and in general it looked like it's powering the mobo but there was only black screen, or was there no reaction to the switch at all?

If the PSU is working, check the voltage between the 2 pins that were shorted in oder to clear CMOS. Just be careful not to short them out again with probe leads.
On the other hand, if the PSU is not starting but otherwise checks OK with another mobo, then I'm afraid you've most likely burned out some copper on this one. Sometimes it can be repaired but the hard part is to actually find the fault - and it can be inside the PCB (inner layers).

"Nothing" here indicates that there is no response from the system. I press the button, and the system just sits there with no activity whatsoever

First thing to try is remove everything accept video and 1 stick of ram.
System doesn't power on? try again replacing one of the 3 each time. (and CPU if you have a spare)
If you still don't get anything you know its the CPU or M/B.

Try replacing the CMOS battery. I've had TWO boards now (three, actually, but two were the same model) play dead when the battery went flat, and wouldn't power up without a battery either. Put a new coin cell in, and it was up and running like I wasn't just planning its funeral... One was dead from the moment I got it, but the other decided to go AWOL during a brief tear-down to swap optical drives. Worked when I shut it down, wouldn't power up after I put it back together.

I never would have guessed before this.