New Build PC - Banging my head!

I've been building PC's since forever but I'm totally stumped here!

I havs a mini atx pc working and decided to upgrade it. I removed the CPU and managed to damage the pins (long story) anyhoo, sold that on eBay, who would have thought there was a great market for damaged cpu's?

Bought the new CPU and installed, no boot, nothing. I wondered if I'd damaged the motherboard somehow, couldn't see how but nethertheless I maanged to get the ideitcal board for not much money so I've replaced this....still nothing. Fans whirring so power is coming through to the board.

I have a new mobo, new cpu, new psu, memory etc. but it just will not boot. I'm getting no signal to the monitor.

I've tried all the usual stuff, stripped it to minimal components, reset cmos and so on but nothing. Popped a speaker and removed RAM and booted but I don't even get the beeps warning me no ram installed.

The only thing I'd mention is that the previous CPU had built in graphics and used the onboard graphics sockets. I now have a newer CPU which doesn't have the graphics so have a seperate graphics card. (Yes I've tried 3 of those as well!)

I also wondered if PSU wasn't powerful enoguh, I have 500w which should be fine but I am limited with the micro case as to what I can fit.

Obviosuly I can't get into the bios to make sure it's seeing the pci graphics card but it's the only possible issues I can think of.

Any ideas?

Just a stab in the dark here but, as your original cpu and mobo had onboard graphics then the setting to disable this may still be in th BIOS, which of course you can't access now! Have you tried removing and reseating the CMOS battery?

Yes this is what I thought but I've installed a new motherboard. Yes, removed and reseated battery on both boards, reset cmos.

I have a feeling the bios will need updating but it should at least allow me to get in there.

I'm going to try another cpu with onboard graphics

Ok all sorted! I was installing a newer Ryzen 5 CPU onto a slightly older Motherboard so had to flash the BIOS to see the new CPU.

All I needed was a CPU that the board could currently recognise so I could get into the bios to flash it and voila, all sorted!