Accidentally reduced cpu voltage on MSI b350

[ian.t.davenport]

Strange one, when messing in BIOS for first time before OC’ing, I somehow reduced the voltage to my
Ryzen 1600 to 0.9xx V (can’t remember all decimal points) and clicked save/exit

Immediately I got these problems:

- no display output, completely black screen on 2 monitors with hdmi or do
- keyboard and mouse no longer work
- power switch turns pc on, but won’t turn off with single press. I have to hold down to switch off

Solutions I’ve tried:

- reset cmos/bios. I’ve got no jumper cap so have connected pins with screwdriver (with pc on and off and plugged in at wall)
- removed cmos battery
- pulled a stick out

Nothing works. Please help me :/

 

[jakubek160]

Hello , I had a lot of problems with msi b350 motherboards. Keep in mind , that removing a cmos battery might not work if not removed for more than 12 or sometimes 24 hours. Take out the cmos battery , disconnect all the cables from power supply and wait 24 hours without the battery in. After that time , connect all the stuff and the battery. See if it works. It worked for me when I had a problem with changing clock speeds. Have a great day!

 

[TJ Hooker]

What exact mobo do you have?

Try shorting the clear CMOS pins with the PC off and power removed (PSU turned off and/or unplugged) if you haven't already.

Edit: Actually, looking at the manual for that mobo you're supposed to leave the PSU turned on and plugged in while shorting the clr cmos pins. Just need to turn the PC off.

 

[ian.t.davenport]

Jakubek- I’ll keep the battery out overnight thank you.

TJ - tomahawk b350 with Ryzen 5 1600. I’ve tried shorting them with pc on/off plugged in/unplugged, no joy

 

[ian.t.davenport]

In case someone stumbles across this in the future with the same problem, here is the solution:

The CMOS reset was not fixing the problem. None of the debug LEDS were lit on my board so I guessed the CPU/GPU/Boot disk were all fine. I managed to get the Motherboard RMA'd it and switched to a MSI X470 and all is good again.

So must have been fault on the old board, no idea why lowering the CPU voltage would have caused that :/