Exactly which problems did we eliminate?
Does the computer shut off if you're in the bios?
Does the computer shut off before the windows set up disk can start a repair?
Does the computer shut off faster the more often you turn it on? For example, 5 seconds if you had it off for 5 minutes and 1 second if you've tried it several times in a row?
If it shuts off while in the bios or faster the more times you try it, it's probably overheating. In fact the first thing I do before trying to fix one of these things is clean it out and make sure the fans are working. A hot CPU or video card will either make them shut off or just act like they're on drugs.
Look at it when you turn it on, see if all the fans turn and get a can of compressed air and blow out all the heat sinks under the fans.
Does the computer shut off if you're in the bios?
Does the computer shut off before the windows set up disk can start a repair?
Does the computer shut off faster the more often you turn it on? For example, 5 seconds if you had it off for 5 minutes and 1 second if you've tried it several times in a row?
If it shuts off while in the bios or faster the more times you try it, it's probably overheating. In fact the first thing I do before trying to fix one of these things is clean it out and make sure the fans are working. A hot CPU or video card will either make them shut off or just act like they're on drugs.
Look at it when you turn it on, see if all the fans turn and get a can of compressed air and blow out all the heat sinks under the fans.