Is the power supply on Dell proprietary? Some places I read it is some places I read its not..I have a customer who said her Dell computer will not boot up, just blinking power button, then when I had it, it booted up just fine..she's being told by a "family friend" its the power supply and may well be, but I couldn't replace it in good consience while I'm staring at her log in page, and she was in such a hurry she needed an answer yesterday so I just gave it back to her..it powerd off, and powered back on fine..then of course soon as she gets back home she calls and says it won't start again..I was only able to talk to her in 2 minute conversations so I didn't do anything at the time, but since I'm getting it back tomorrow I'll give the power supply a good once over..reseat RAM, etc..