I got it from dell. From their website I was redirected to startech.com. "ATX12V 2.01 power supply for dell pc's" 400 watts. The old one was 250 watts. I am looking at the box of the new one - and where it says "compatible dell systems: dimension series models" - there is no 8400 - which is what I have. Could this be a/the problem? I just noticed that.
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And no that wouldn't be the problem. Its getting enough power but its starting to sound like to me is you cd/dvd drive is bad. I had this happen to me when i was working on an old dell.
When you push the button on the drive does it come in and out?