A faulty fan would not cause this, since it would not prevent the pc from powering on. It could be something as simple as a bad switch or a memory defect. Take the RAM out and get the dust off it. Make sure power supply is correctly connected to motherboard. If no video card is detected, - could cause these symptoms as well.
I would check your fans first , a failed cpu fan will cause the computer to overheat and not start.then cables, add-in cards and memory to be sure ones not halfway in it's slot.. then i would suspect the power supply, they can be missing power on a rail and still have a light on the back. you can buy a power supply tester at tigerdirect for 20 dollars. once all this is checked , i would look to the motherboard..
hope this helps in the decision making process..
Regards.
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