I usually leave my computer on overnight (a bad habit, I know). When I came down a few days ago, I got a no signal from my monitor. First I restarted, and the fans and lights and came on, then immediately went off. A couple seconds later, they tried again. Finally on the third go around everything stayed on. I noticed my CPU fan did not come on during the first two boot ups.
Just to make sure it wasn't a graphics issue, I tried a different monitor, a different VGA cable (with both monitors), and unplugging and replugging in my GPU. No success, so I think the computer isn't actually booting up (caps lock light doesn't go on/off either).
The CPU LED would flash during the boot, but then turn off once the CPU fan was going. However, the RAM LED would stay on.
I put in a new CPU/fan and the CPU fan would go on right away, but the computer would still start and stop a few times before finally staying on, with the RAM LED on.
I tested each stick of RAM and the same start up problems happened. I used the fan that come with the CPU. My specs are:
OS:Windows 7 64-bit
Motherboard: ASUS P8Z68-V PRO/GEN3 LGA 1155
CPU: Intel i5-2500K
PSU: SeaSonic SS-750KM3 750WATX12V V2.3 12V V2.91 SLI Ready 80 PLUS GOLD
So to sum up, when booting, computer starts and stops, then finally stays on, but the system is not actually going.
I've also tried unplugging all connections and re-connecting. Any help is GREATLY appreciated!