Broken component - CPU or Graphics Card

My PC has suddenly not outputting anything to my monitors. As soon as I pres the power button, both monitors I have go straight to power saving mode. At first, I thought it was the graphics card, so I took it out, cleaned it, reinserted it but no joy (I do get the green light on the card). I also tried connecting one monitor straight into the motherboard but to no avail. So, now I'm thinking it's the CPU. It's an Intel Pentium G3258 overclocked to 4.4GHz. If that was broken, then that would make sense why I have this problem.

Any advice would be greatly appreciated

Reset CMOS first it could anything.

What does the PC do? Lights fans

do you have a spare cable you could run to one of the monitors from your gpu? as I have had the same problem recently and it turned out to be a faulty displayport cable and gpu connection

If you're overclocked something might have given up, reset the BIOS to its default and see what it does, also look for any popped caps on the board.