This next computer recently started shutting down if it's used for more than an hour. Tim, the owner, says he uses it primarily for managing large spreadsheets for work, as well as email, web browsing, and documents for business proposals. He says his business is doing so well that he recently moved to a new office space. Right after the move, he came in for work that morning, booted up his desktop computer, and set about his daily tasks. An hour later, the computer suddenly shut down and wouldn$$t start again. He switched to his laptop as a backup, but the desktop did the same thing the next day, and that$$s when he brought it in to you.

Symptoms:

The computer shuts down within an hour of normal use. When you boot the computer in your lab, you notice that it$$s kind of noisy.

Question:

Which of the following are possible diagnoses of the problem?