First inspect the interior of the computer case while the system is running. A high pitch whine (ambulance sound) is often a cable getting in the way of one of the fans. Adjust accordingly if that is the case.
Second, is your computer starting/completing the POST self test? Do anything at all appear on the screen?
If not, try reseating CPU and then the RAM. Do each these steps one at a time. Sometimes that slip out of place because of the interior heat temperatures. Let me know if this helps or provide more info.
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