I came home and my desktop computer was frozen/locked up on my desktop like a freezeframe on video. I wasn't worried as, although rare, these things happen. I reset the computer. Now the trouble starts. It doesn't even make it into Windows when it shuts completely off. Now I start to trouble shoot. I restarted 4 more times and every time between 20 seconds and maybe a minute, it shuts itself off completely. Next I let it cool down, although it was not hot. I have a water cooled gaming rig with 5 fans and the power supply fan. I opened it up and it was a bit dusty inside. I thoroughly blew all the dust out. I then hooked it back up and hit the power button and it does the same thing. I tried it 3 or 4 more times and the same thing every time. I am now assuming that the power supply may have failed, but I wanted to get some other professional advice before I buy a new power supply. The computer is about 2 1/2 years old. Gigabyte mother board, 8GB RAM, GTX 660Ti Vid card, 700 watt power supply. The rig was built with my specs by Cyberpower and has given me NO trouble ever until now.