Motherboard Post's But No Video Or Peripherals

[TwistedSlink]

Hi, I recently acquired an Asus p8h61 rev 1.00. I paired the system with an i5 2500 and I cannot get the system to display any video. Here is what I tried...

-reset CMOS multiple times
-Reseated memory multiple times and cleaned with contact cleaner
And the memory is working as I tested it on another pc.
-Tried turning the pc on without RAM
-tried multiple graphics cards which all work as I tested it on another pc.
-i have checked the pins for damage or if they are broken and they seem to appear ok apart from 1 pin which is higher than the rest.
- I have also reseated all cables and tried booting it without a hardrive
- I've also tried holding the power button for 30 secs but to no avail.
- also my PSU doesn't have switching power options so it's constantly on 240V which is the voltage where I live. And it's confirmed working as I have tested it on another computer.
- I have also tried the motherboard using a 3rd gen celeron and an i5 3570 but to no avail.

It turns on but it doesn't display a signal. It doesn't restart over and over again. It remains on until I turn it off.
Out of note my mouse does seem to flash once as it boots but doesn't stay on for more than a second at most.

I cannot diagnose any beep codes as my motherboard doesn't have a pc speaker. I also can't use the onboard graphics as the motherboard doesn't have a video out strangely.

I seem to be at a dead end. Any help would be appreciated.

Thanks

 

[Barty1884]

Without display out nor beep codes, how are you determining that the system has indeed posted?
With no video out and no power to peripherals, I see no indication of a successful post, only of power being received.

Unfortunately, only the 2500 is definitively compatible. IvyBridge Celerons and the i5-3570 were not supported out of the box, they needed a BIOS update.
https://www.asus.com/Motherboards/P8H61/HelpDesk_CPU/

Do you know for sure that the i5-2500 is working?