I purchased my Dell Laptop (Latitude D800) in 2004 and for the past few months, I've had some trouble getting it to boot up. It'll get through various stages of the boot up process and then just black out and start over. Sometimes it'll make it all the way to the desktop and shutdown. After some persistance, I'll usually get a good boot and I'll be up and running for weeks on end. It'll go into and come out of hibernation just fine, when I do that, so I just leave it running. Not something I did often before the problem occurred, but considering how difficult it is to get it to be operational after shutting it down, it's my work around.
I don't think it's an overheating issue, because I can leave the laptop shutdown (not hibernating, but powered down) overnight in hopes of it behaving the next day and it'll still give me the problems in the morning.
I'm running Norton Anti-Virus and it's showing a clean slate.
I'm guessing it's a hardware/powersupply issue? It's obviously way out of warranty, so is there anything I can check myself being a semi-competent but by no means expert computer user?
Any advice would help! Except for "buy a new laptop," however true that might be.