I have a issue with my system. Everything except the PSU is a year old. It's a ASUS P9X79 Deluxe with a i7-3930k processor. Also I have a Aspire Warlock 900 Watt PSU (4-5 yrs), and a non-GHZ Radeon 7970 GPU. And for RAM I use 4 X 4GB Kingston Hyper X 2133. I've had my system for a year now. And this is what happens. After booting windows (7, 8.1) my system hangs with no disk activity, but my mouse still works with no response to any mouse clicks. After 5 - 20 minutes, It'll resume normal operation. But then it'll repeat this again. Here is what I have eliminated so far. Before I had a SSD, now I am using a RAID setup, and it still does this on both setup's. I have tried using different SATA transfer and power cables. I also tried turning on safe mode, and this still happens. I have run S&M stress test, Memtest v.20, Prime, I have also eliminated thats its not a RAM issue and not a HDD issue as I have swapped older parts. So it;s either a VGA issue, Mobo, Cpu, or a bigger chance its a PSU since its a little old. To sum it all up, I have a issue with my system freezing up. Please help.