My PC keeps turning off...please help

[ZohnoReecho]

remove the heatsink http://youtu.be/foB7WJYXI60?t=1m20s and mount it back http://youtu.be/-Z-r6bjDfJE?t=40s
the pins are made of plastic so try pulling them one by one perpendicularly using the handle to not damage them.

[MissRoxy]

remove the heatsink http://youtu.be/foB7WJYXI60?t=1m20s and mount it back http://youtu.be/-Z-r6bjDfJE?t=40s
the pins are made of plastic so try pulling them one by one perpendicularly using the handle to not damage them.

I think it'd be best to let his friend do it because he's unfamiliar with computer hardware.

( By the way, you forgot to mention that he needs to remove the current thermal paste and re-apply. )

[Shirai]

I think it'd be best to let his friend do it because he's unfamiliar with computer hardware.

This indeed.
If you don't know how to put a computer back together it is better to have someone do it that does.
Even taking it apart can cause irreparable damage if you're unfmailiar with a computer's internal structure.

By the way, the videos posted show an Intel stock Cooler, Earlier in the thread the TS said he has an AMD rig.
The cooler mounting systems for the stock coolers of both CPU manufacturers are usually different.
Aside from that, the could be a completely different cooler altogether on that CPU, we don't know.