I have been having problems with the power supply on my 8400 for the past week I would turn it on use it go away for an hour or so come back and find it off with just the blinking amber light on. I would have to hold the power button in to get it to turn off. Also for a a couple years I have had problems with the low battery voltage message at start-up, but I always just by-passed it(never had clock problems and it seems like from my research this was a problem with some Dell computers and surge protectors). Tonight I turn it on use it for a couple hours go away for two hours and come back some problem it has shut off and just has the blinking amber light. Now usually I could just hold that in and then push it in again and it would turn on...not so tonight. Any suggestions? Thanks.