Recently when I try to boot up, sometimes the system won't post past, ie no BIOS screen, no beep from mobo. I recently reapplied arctic silver to my processor and fan because I noticed idle temps were running high. After applying the silver and trying to boot, the system generally won't post and if it does, it will hang on the BIOS screen. The fans spin up, the HD's look like they power up as well. It seems like it's between the mobo and the processor. Any tips?
Sounds like you used too much AS5, or possibly didn't get the push-pins in properly. Or maybe got some foreign particle in the AS5.
You should have cleaned off the processor and heatsink using rubbing alcohol and a coffee filter. Then you would have applied a small amount of TIM to the center of the CPU, about the amount of a cooked grain of rice.