If the hard drive is fine, then you could purchase and inexpensive USB hard drive enclosue. Placing the old hard drive in the enclosure, then plugging it in to the new computer might allow you to easily transfer files but unfortunately, you haven't told the operating system involved or any of the troubleshooting procedures you've used to try and get the old machine running.
Can you access the BIOS in the old machine?
Have you taken the cover off and blown out all the dust and junk with compressed air?
Will it start in Safe Mode?
Since it may simply be a power supply issue, have you thought about replacing the power supply?
If using Windows XP, have you tried using the "Last Known Good Congiguration"?
Hope this helps and let us know more.
I have a dell inspiron 8000. Recently, the computer just stopped running. When it is turned on, the startup screen will come up and the computer will shut off a few seconds later. Depending on how long it has been turned off, it will take differing amounts of time before it shuts down. I just got a new dell xps 400. is there a way to transfer the information from my laptop hard drive such as music, pictures, and files to my desktop hard drive without having to bring it somewhere and spend over $100 on it?