Hello, just want to say I created this account to post this issue..
I was upgrading the cooler and video card in my Frankenstein PC, when upon powering the machine it would not boot video. There also seem to be no beep codes.. for anything. It may simply be the motherboard (it's almost ancient now), but I'd hope it's not for the moment.
This is the motherboard, from an HP Pavilion Special Edition a6745f.
In a new case, I replaced the PSU, RAM, and CPU first and everything went well. The PSU was upgraded to a 650W unit and the CPU was upgraded to an AMD Phenom II Black Edition. Memory was upgraded to a total 6GB (replacing 2x1GB modules with 2x2GB units). A temporary graphics card was also added: a 256MB GeForce 9400GT. Again, everything was fine.
Then my card and cooler arrived. Keep in mind, I was using the stock cooler from the HP machine with no huge issues (on average 57 C with fresh thermal grease). I removed the cooler and installed a larger, 120mm Cooler. The heatsink was joined with a new GeForce GTX650 Ti.
And now it won't POST.
I've checked all the cables, rebuilt the machine, tested the PSU, even tried booting the machine with the old CPU fan in the CPU port and the new cooler in the SYSFAN port. It may be worth noting that I have two other fans running from MOLEX connections, the board only has 2 total fan ports. Also, The CPU fan port will spin up any fan, but none will continue to run. They only spin for 3-4 seconds.
Any ideas? I'll provide more information if needed. THANKS