My computer crashes 2 minutes after start-up. It will not stay on long enough to find out what the problem might be.
What can I do?

Have you tried safe mode? We need more info on what is going on & more information on your computer. Does it boot up normally? Do you get a blue screen, does restart or does it just shut off? 2 minutes is plenty of time for some investigating. One thing I would suspect would be overheating. Install speedfan & monitor the temperatures. You can set speedfan to log the temperatures. Hit configure & then for each device listed under temperatures click on each and make sure that "logged" is checked. Now click on the "log" tab, select enabled, & then check add header to file. The log should be at C:\Program Files\SpeedFan & called SFLogyyyymmdd.csv [for year, month, & day]. Right click on the file, open with, & select notepad. Copy & paste the contents in your next reply. By default windows will open it up in excel if you have that installed. I think that it is easier to read in notepad.