I built a new computer about a month ago and I've been having some weird problems.
First of all when I have my iPhone plugged in to charge, the computer won't turn on or off. Second, I have two external hard drives. Neither of them gets recognized by the computer and one of them causes all of the other USB ports to lose connection. As soon as I disconnect that hard drive all the other usbs reconnect. Also if i try to start the computer with the external connected it wont even power on. as soon as i disconnect the hard drive it starts to turn on. i dont even have to press the power button again. Also when I'm playing games, after a while every once in a while the computer does like I pulled the plug.
I've searched around on the forum and have not seen anything like this. I'm thinking either my mobo is broken or its the psu.
Not sure if its in my sig but my system is:
2x4gb ddr3 1866
Msi hd 7850 oc'd to 1170/1250
Msi z77 mobo
Antec trupower 2.0 550w (used when I got it)
The Antec TruePower 2.0 is an old design from a now discontinued series. They didn't have any PFC and only had mediocre efficiency.
If the power supply is shutting down in the middle of a game there may be a heat issue in the power supply triggering its thermal protection. The thermal protection is set to 50°C. Did you feel the power supply's case to determine if it was hot?