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Re: system doesn't powero u, fans turn on also light on...
Best solution is reinstall the OS.
it is difficult to pin point the problem, since there are lots little thing can cause the OS not to function correctly.
if all possible install OS on a new HD and use the old HD as second, you still able to see what is on the second HD if that is what you want. if not reformat and reinstall.
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I'm going to assume manual but Auto is simular and i can give some direction if you have that as well.
There will be a black with tan wire at the blower resistor. This is the wire the HVAC control head grounds to turn the fan on high speed. With a test light hooked to power unplug the resistor, set the blower speed to high, turn the key to the run position. the test light should turn on when you probe the connector. If it doesn't pull the control head and back probe that same wire at the back of the control head with everything still plugged in. If the test light again does not illuminate the the control head is bad and not providing ground
If the test light does turn on when you probe the blower resistor connector plug the resistor back in. Turn the blower speed to the low setting. With your test light hooked to ground see if there is power on the black with tan wire. if there is turn the HVAC off and ground that wire with a jumper wire. the fan should run at high speed. If it doesn't you have a defective resistor.
Actually, there is nothing you can do with the hard drive. If its shorting out the power supply when its pugged in then it is defective. However, most hard drives carry a 3 year warranty from the manufacture. If the drive is younger then 3 years old, I would call the manufacture and get it repaired or replace. Hope this helps . . .
Try unplugging, then plugging back in the 20/24pin power connector. When you plug in the power connector, make sure the power supply is OFF and the switch in the back is OFF and nothing is plugged into the computer.
If the fan is not working, the lamp will not fire. If you have the owner's manual, it should indicate what the flashing lights mean. Check to make sure that the panels are seated properly. When you replaced the lamp, the outer cover was removed. If that is not seated back 100%, the unit will not work. There are a number of safety "checks" built into the unit to prevent damage and possibly fire as the lamps get really hot.
Check the items above and let us know your progress.