Computer won't Start

Signorino

Signorino

Member
When I turn my computer on, all the lights light up and the fans start spinning. After about a second, everything shuts back down without any beep code. I've already tried everything discussed in spirit's "Tech Guide: Diagnosing a PC which will not POST or Start" including removing any extra components in the PCI slots, switching RAM sticks to different bays, pulling the motherboard out to ensure it isn't short circuiting on the case, and resetting the CMOS. I don't have any other pc's available right now to start switching out parts. Is there anything else I can try?
 
Computer has been working fine for months until Saturday morning. I re-applied thermal paste to my processor on Saturday, and it hasn't turned on since. I tried re-applying it again yesterday thinking I might have done it wrong the first time, but nothing changed.
 
Check to make sure you didn't drop any paste in the cpu socket or on the pins of the cpu. Did you put the processor back in correctly?
 
I was careful not to get any paste on the pins, and I just double checked the processor to make sure that it's in correctly.
 
And you tried resetting cmos? was there a jumper or did you remove the battery? Removing the battery is hit or miss. Usually you have to remove power from power supply, press power button on the case for 10 seconds to discharge any remaining power and then wait 10 minutes.
 
Are there any bent pins on your CPU? (This can happen with AMD CPUs)
You plugged all power connectors on the board back in?
 
My motherboard has a button to clear the cmos, I used that.

I have an Intel cpu. Yes, I've checked multiple times to make sure everything is plugged in.
 
Can you take a picture of your internals?
A button should work, but I've seen occasions where this feature didn't work properly, you should try it with the jumper to be certain.
 
0811151028b_zpsxx3pjhyl.jpg~original
 
I'd look really closely at the LGA socket to see if there were either any bent pins or thermal paste that made its way out into there.

If you aren't hugely careful removing/remounting the CPU it's pretty easy to damage the socket pins.
 
After looking again, it looks like I did bend three of the pins in my socket. Have any advice on trying to bend them back?
 
This method seems to work OK, I've done the same on a Sabertooth Z87 board:
http://blog.outletpc.com/2014/11/23/fix-bent-pins-intel-lga-motherboard-lga775-lga1155-lga1150-etc/

You just have to be amazingly careful not to bend any other pins around the one you're working on. They also can break off if too much force is applied :(

A giant magnifying glass and removing the board from the case helps a lot.
Also, for repasting LGA CPUs a lot of the time you can leave them mounted in the socket to minimize remounting risk.
 
Broke one of the pins in the process. Oh well, at least I learned a valuable lesson; stop being an idiot. I feel like I learn that one a lot, though. Thanks anyway for the help.
 
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