Computer doesn't preform post, but powers up, fans work, and leds come on.

[kingofat]

Hello. My family uses a HP Pavillion p7-1436s desktop pc. A month or two ago it has shut off and wouldn't power back on for several hours. The PC itself would power up with fans running and the led power light lighting up. There was no post beeps however. I performed the troubleshooting steps I found online. I'd reseat the ram and moved it to other sockets and still got the same result. When the ram was removed it would give a post beep when powered on alerting that there wasn't ram in a socket. I removed the video card and tried powering up. I didn't get any beeps not even the quick beep that has always been present that i know of informing that the post test succeed. Well we left it alone and eventually after repeated tries it finally booted up.

After that sever times the computer has cut off it would do the same thing I described earlier where it wouldn't boot, beep or anything but the but fans would run and the led would light up. It take 20 to 30 if not more resets of the computer before it'd boot up. Now yesterday the power flickered on and off shutting the computer off. It would not start (except fans spinning and light coming on) after doing the resets for well over an hour. We let it sit for the rest of the day and then this morning it booted back up after my brother tried again randomly. Fast forward to now, while I was at school my family told me the computer shut off on its own with no warning and now it won't boot up except when you hit the power button like always the led light would come on, there would be no beeps, and the fans are working on it and the gpu. Other than that it won't start up.

Based on what I've tested I had narrowed it down to the gpu, cpu, motherboard, or ram (it really can't be the PSU we just bought it two years ago brand new) After what happened today and yesterday I'm suspecting the cpu but i'm not sure. I need more opinions and here I am any help would be appreciated. Here are the specs that i pulled from the HP site as I didn't truly know them

[wb2001]

@kingofat'

As this unit is circa Sept 2012, I would suggest the following:

1) Remove power cord, open side panel, and clean dust from CPU fan and the aluminum heatsink. This can be accomplished without removing anything,  while keeping the fan blades stationary, use a can of compressed air to blown dust from the blades and crevices of the heatsink fins. A nice crevice tool is pipe cleaners.