Help with troubleshooting Bios Problems

[SexyKat4]

Hey Guys,

 

So I live in South africa and we have constant power outages (loadshedding). A while back my pc got stuck in a bootloop where it will show the bios screen but keep restarting as soon as you leave the bios. I could get in to the bios screen by pressing the DEL key. I spoke to a friend and he suggested that it might be my BIOS that got corrupted. Yesterday I flashed my BIOS and hooray, I got into windows. I then shut down the pc and when pressing the power button absolutely nothing happens, not even a light. It is as if the pc is unplugged, but my usb ports do have power. I thought I might have bricked my motherboard, but this morning when I tried again the pc started up and booted to windows. I then shut it down again and had the same problem again? I have tried shorting the power pins directly on the motherboard, but this does not change the behaviour.

Does anyone perhaps have any idea what this could be? Should I try again when it responds and flash an older version of the bios?

My specs:
Intel I5 7500

DDR4 Ram
Gigabyte Ga-B150m-D3h motherboard

For saftey, I removed my GPU and Wifi Card when performing these tests, so I am sure it is not that causing the issue. Pretty sure its related to bios since I can now (sometimes) get the pc to boot in to windows.

UPDATE:
I realized that if I unplug the power and plug it back in it boots fine again. So I was going to live with it. But after a few times the Computer is now back in a boot loop with no video out. So I think the motherboard might be dead now. 

[Somerandomtechyboi]

When the problem occurs try using a screwdriver to short the powerbutton on the mobo instead of using the case powerbutton

 

Also try wiggling the 24 pin power connector

 

If that doesnt work id just go straight to taking the mobo out (everything disconnected so mobo only), taking all heatsinks off and the cmos battery out, discharge by shorting powerbutton and clr cmos, rinse with some running water making sure everything gets soaked, then dunk in a bucket of water for an hour or 2, leave to dry for a day or 2 depending on climate. This super cleans the board and should fix your powerbutton issues, no this doesnt do any damage just a deep clean pretty much and i have done this to many boards and it does indeed fix problems like powerbutton not responding or other stuff like dirty socket causing no display

[SexyKat4]

1 hour ago, Somerandomtechyboi said:

When the problem occurs try using a screwdriver to short the powerbutton on the mobo instead of using the case powerbutton

 

Also try wiggling the 24 pin power connector

 

If that doesnt work id just go straight to taking the mobo out (everything disconnected so mobo only), taking all heatsinks off and the cmos battery out, discharge by shorting powerbutton and clr cmos, rinse with some running water making sure everything gets soaked, then dunk in a bucket of water for an hour or 2, leave to dry for a day or 2 depending on climate. This super cleans the board and should fix your powerbutton issues, no this doesnt do any damage just a deep clean pretty much and i have done this to many boards and it does indeed fix problems like powerbutton not responding or other stuff like dirty socket causing no display

Thanks very much for this, I have actually tried to bridge the pins directly on the motherboard (sorry I failed to mention this), but it unfortunately doesnt fix the problem. It is still just dead. I will try the Deep clean this weekend.