PC died (Motherboard?)

[Lare111]

Today my PC started normally but some seconds later it turned off and didn't turn on again. Pressing power button does nothing and there's a red overvoltage led on the motherboard. Some weeks ago I also had some problems because my PC didn't turn on at the first attempt and fans went crazy. That seemed like a motherboard problem.

 

I re-attached all power cables but that didn't help. Then I did the paperclip test for the PSU which seems to work. I don't have other PC but I was able to power on HDD, Optical Drive and fan with molex connector. I tried to reset CMOS which should disable overvoltage protection but the led didn't turn off.

 

Should I just order new motherboard? My mobo is almost 2 years old MSI B150M Mortar and PSU is 5 months old Seasonic G-550. Rest of the specs are in the signature.

[Radium_Angel]

Hmm. A little power from a PSU can power up simple devices by their own. I'm not certain I'd rule out bad power supply. Borrow one and see before spending big bucks

[Blackhole890]

try getting msi technical support to see if they can solve your problem because it might be a "bad motherboard" even if the warranty is gone, just try it and might they could give you a new mobo if my statement is true

Edited November 8, 2017 by Blackhole890

[Lare111]

I tried using multimeter and 3,3V, 5V and 12V rails were all perfect. If PSU has correct voltages and can power very old 5,25" 10k RPM HDD, Optical Drive and a fan I don't really think it's broken.  I also don't know where I could borrow another PSU. Also MSI doesn't have support in my country and the store where I bought my mobo has gone bankruptcy. 

[Lare111]

Resetting the CMOS with button wasn't enough. I removed the CMOS battery and after that my PC booted just like nothing had happened! What could have caused this? Bad battery, bios bug or broken mobo?

[iHDCool]

Can't you get like another cheap-ish PSU just to try your rig with the other PSU? 

[Lare111]

7 minutes ago, iHDCool said:

Can't you get like another cheap-ish PSU just to try your rig with the other PSU? 

My PC works fine now after CMOS reset so PSU definitely isn't the problem. I just wonder what went wrong with CMOS when my PC didn't want to boot.

[Radium_Angel]

Power spike perhaps? Glad it's fixed (for now anyway)