Question Power seems to be working but no display and no usb working

[finesse.kawal]

Hello

I recently switched out my processor, swapping a ryzen 3 1200 for a ryzen 5 5500. I have a gigabyte b450m ds3h motherboard with the appropriate am4 socket. Replaced the processor easily enough, screwed everything back together, but now for some reason, my screen won't register the computer. Fans work, graphics card lights work, everything looks same as yesterday, but no display and no mouse and keyboard. It's not a power issue as far as I can see, since my rgb computer mat turns on fine. Scrolling through here I've found it could either be a faulty motherboard - although I don't understand what would make a motherboard faulty when I'm replacing a processor, and the ram being out of place, which I've since taken out and put back in. Anyone have any ideas on how to repair this? It'd be really helpful.

 

[bignastyid]

Did you make sure you had a bios version that supports the new cpu? You need bios version F62 or newer for the 5500.

 

[rgd1101]

full system spec? include brand and model of the psu

 

[finesse.kawal]

full system spec? include brand and model of the psu

Corsair cx450M
B450m ds3h motherboard
Ryzen 5 5500 processor and the fan that came with it
And a gigabyte graphics card but I don't know the model number (can send photo if it'll help)

All in a nzxt h510 cpu tower

 

[finesse.kawal]

Did you make sure you had a bios version that supports the new cpu? You need bios version F62 or newer for the 5500.

I didn't think I'd have to reconfigure bios considering the new processor would fit the socket fine. But now I've tried switching back to the old processor and it hasn't made a difference.

The motherboard has a dotted yellow light in the back whenever I turn it on, does that help at all?

 

[bignastyid]

I didn't think I'd have to reconfigure bios considering the new processor would fit the socket fine. But now I've tried switching back to the old processor and it hasn't made a difference.

The motherboard has a dotted yellow light in the back whenever I turn it on, does that help at all?

It's not just about socket compatibility, you have to have bios compatibility aswell.

Put the original cpu back in and reset bios defaults. Instructions are on Pg 18 of the manual. Then see if it will post.

 

[finesse.kawal]

It booted up fine, which is a lot better than it was doing before. I'll likely take it into somewhere instead of messing with it again, but thank you.

So I have an idea going in, what exactly is bios? And I've never messed with it, so why would it ever be OFF defaults?