I got a Dell Dimension 5150 that is my movie maker. It has become unreliable due to the fact it slows to a multi minute crawl to do tasks. It spasms playing music with the cpu showing like 3% usage. I have done the memtest with 14 passes which showed my 2 sticks of 512 ram are fine. I have swapped out power supplies and tried different sata cables to no avail. I did a clean install and it still over a period os 10 to 15 minutes slows to a crawl. I have reinstalled the cpu with all new thermal paste. It never picks up speed with the cpu fan and touching the heatsink is just warm. Any pearls of wisdom out there. I don't like my babies acting up.