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Run the Dell Diagnostics to test the Fan.
Check to make sure the fan power connector is connected to the mother board.
The fan could be defective.
Reset BIOS to factoiry default settings.
I hope this helps.
Good luck and have a pleasent day.
I would recommend testing the power supply as Dell PS's are not known to be "forever". A power supply tester can be purchased online at Tigerdirect.com for around $20 and they are fairly easy to use (you can also get a new PS there if necessary). If that is not it, I recommend going to a local small computer shop and picking up a used Hard Drive (be sure to get SATA), and switch it for your main HDD,, if the PC starts up and goes to an "Error no OS found" or the ilk, the culprit is your hard drive. I am in CT and fix PC's for a living, I am A+ certified and have passed all the dell Factory Cert tests. If you need help and are in the area or work well over the phone,, let me know I CAN solve this problem.
On the back of the chassis, there are 4 LEDs above the PS2 connections marked ABCD what do they indicate? During the boot process the lights normally flash on and off green, when the boot process is complete, they should all be green GGGG.
If any are Amber then they are indicating a power on self test (POST) failure. AAGG is bad memory for example.