Computer im building wont boot up. help?

September 22, 2012 at 22:40:07
Specs: Windows 7
i built a computer a couple months ago and it has been working properly. today i bought an external fan to enhance my cooling, and when i connected it (im not sure if i did so correctly), i tried to boot the system up, the fans spinned for less than one second and then stopped. So i took the fan out, and tried to boot again but the same thing keeps happening. What is wrong and what can i do?
it is NOT the cpu fan, it is just an external fan. i connected it to a 3 pin connector.
i do not want to connect the fan again. leave theh fan out. i just want my pc to boot up again and work properly. is it possible that the mobo or the cpu has died? the led lights on the mobo work when i turn my power supply on so it cant be computer WAS WORKING PERFECTLY BEFORE THIS STUPID FAN. Please HELP.

EDIT: I took everything out and i tested the mobo with cpu, cpu fan, ram and power supply. i press the start button on my asus maximus iv mobo, and NOTHING happens.

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September 22, 2012 at 22:54:59
Did you connect that external fan to a header on the motherboard?

Did you unplug the computer before you went inside the case?

Try removing all but 1 stick of RAM. Re-seat that 1 stick. Only have the hardware you mention in EDIT.

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September 23, 2012 at 06:38:14
You haven't listed your hardware in any detail except for the motherboard & even that info is incomplete. I assume it's one of these?

There are several 4-pin CHA_FAN headers that a 3 or 4-pin case fan can be connected to, however, there is one PWR_FAN 3-pin header that is NOT meant for case fans, it's for monitoring the power supply's fan speed. Read your manual:

"we recommend that you plug the rear chassis fan cable to the motherboard connector labeled CHA_FAN1, CHA_FAN2, CHA_FAN3"

"i bought an external fan to enhance my cooling"

Why did you feel you needed the extra cooling fan if the system had been running fine for months without it? Is your power supply (PSU) mounted at the top or bottom of the case? What's the make/model of the PSU?

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