Hello. A friend gave me he old computer to see if i can fix it. When i was looking at the dell I seen that the C drive was full. Looked around and there was not enough things in the computer to fill up the drive. So i had an old computer and i took the Hard drive out of that and put it in the dell. When i try to fire it up with would'nt fire up. So i put the old hard drive back in it and when i go to fire the computer up. It will stay on for 3 to 4 sec's and then turn off and then 3 to 4 sec's later it will come back on and turn back off. It keeps doing this... Any Help?