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some powersuplay comes with 2 extra connectors a 4pin based switch connector and a alternate power supply for the fan...you must to be sure if it is comatible......check the model and search on google for compatibility ...
First check the power source, are all connections good and switches on.
Assuming so, are there any led's lit anywhere on the tower when you turn it on or any fans turning other than the PSU fan.
If there are no fans, including the PSU, then the PSU has failed, if there are fans and led's lit then turn it off, remove power source, remove the cover and check whether the PSU is properly connected to the mother board properly (Large multi-pin plug) if it is connected properly,
My sister had the same issue with hers. She said one day it died. I replaced the power supply, the little lights on the mobo came on, but the computer did not power up. Come to find out, when the "best-tec" power supply fried, it surged the motherboard and fried that as well. I replaced the motherboard and it works like a charm.
Heat sink switches? I have to assume that you're talking about a dead mother board but the fans and the LED on the mother board are OK? This is a classic eMachines problem. Their power supplies glitch and take out the mother board sometimes the power supply goes bad too.
IT WAS THE POWER SUPPLY. AS SOON AS I PUT A NEW UNIT IN, IT BOOTED RIGHT UP... NO PROBLEMS YET AND IT'S BEEN ABOUT 20 HOURS. I WAS TOLD THAT A POWER UNIT WILL DO THAT BEFORE IT GOES FOR GOOD(ALONG WITH *********** BOARD)....
when you say "the fan makes a noise like its getting ready to spin", which fan...power supply's or cpu? if you answer power supply, then the POWER OK signal is not returning to power supply and it then quickly shuts down to prevent further damage. double check a firm connection to mother board.
If you answer CPU, then it becomes far more complicated. Try re-seating the memory chips.