Gigabyte Z77 board will not POST until battery left from board with PSU unplugged

[Bencrisp]

Hey guys,

Hope someone can offer some advice/insight. This was working without issue, then I removed from PC, left in antistatic with CPU and Ram in original box. Took out again to test and would not POST. It actually switches on and immediately off again. The POST screen on board looks like it is trying to show something and a Zero and then switches off before it completes.

This is a known good PSU, swopped with another good PSU. I have swopped CPU, same issue. I have tried with only CPU connected, same issue. I have tried other BIOS, same issue.

Rather disappointing for a good board to stop working. If anyone has any idea of what can be done to resurrect let me know?

Thanks in advance

 

[Bencrisp]

Forgot to add, if I remove BIOS battery and leave PSU unplugged, I can get motherboard switched on and POST. Get to BIOS etc, reboots are ok. If I switch off then I need to repeat procedure to get it up again.

 

[Tanka]

Sounds like a weird suggestion but hopefully low hanging fruit. Try a known good/new CMOS battery. Found a dying CMOS can cause weird behaviour.

 

[Switch]

...leave PSU unplugged, I can get motherboard switched on and POST.

This makes zero sense, "my car has no petrol and I can drive jhb to cape town with a caravan attached".

 

[Bencrisp]

Sounds like a weird suggestion but hopefully low hanging fruit. Try a known good/new CMOS battery. Found a dying CMOS can cause weird behaviour.

I did swop out for brand spanking new one out of its packaging...also thought maybe voltage was low. Checked with voltmeter and old battery was good. Same result

 

[goldfritter]

This makes zero sense, "my car has no petrol and I can drive jhb to cape town with a caravan attached".

He means: if he takes the battery out and then disconnects the PSU and leaves it for a while, and then reconnects the PSU and switches it on again, it works, until he shuts it down again.

 

[Bencrisp]

He means: if he takes the battery out and then disconnects the PSU and leaves it for a while, and then reconnects the PSU and switches it on again, it works, until he shuts it down again.

This is correct yes, thanks for adding the missing info

 

[Nospheratu]

....The POST screen on board looks like it is trying to show something ....

Try holding the pause key on your keyboard to try and catch that screen before the zero pops up to see if there's any useful info.