Loud fan and no signal to screen

April 4, 2014 at 18:49:20
Specs: Hewlett Packard, Amd sempron i5 / Samsung 2gb ddr3
I was installing a led light to the case of my hp 6005 pro while i was listening to pandora . The positive and negative cable then touched the motherboard when i was not paying attention ( there was no spark but the computer did beep then shut down ) . i waited about 30 minutes before i booted the computer back up to make sure there was no melted parts , i also unplugged the gpu and the ram . I then booted the computer up and saw that all that was turning on was the fans and at a very loud alarming rate . I looked at the dvd drive , external hdd , and usb flash drive , not one of the lights were on ( however the small green light on the motherboard was on ) . This is about all the information i have and i really need help i put alot of money into this computer and id rather not spend anymore #PLEASEHELPME

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April 5, 2014 at 00:19:50
I can't believe you were so irresponsible as to try installing something in your PC while it was running, for even more important than system damage is the high risk of personal injury.

You have probably damaged the motherboard or at least several components, or it may be you might just need to buy a new PSU so try that first.

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April 5, 2014 at 01:11:08
If you manage to get away with just having to buy a new power supply I think you can consider your self extremely lucky. To be messing about inside a computer with the power still applied is a gamble on a par with with jumping out of an aeroplane using a parachute packed by a chimpanzee.

However, the chances are there are components fried on the motherboard which would make it beyond economical repair.


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April 5, 2014 at 04:43:55
Wow, face it, you screwed things up royally.
Depending on where on the motherboard you touched and the voltage in the wire, you either fried the power supply, the motherboard, or both and if you were anywhere near the CPU, possibly that as well. There are three voltages going into the motherboard, 12V, 5V, & 3.3V plus circuits within the motherboard carry signals that may be as low as a few millivolts (mV), so when a higher voltage enters a circuit that is intended to carry a small voltage, something burns out. If the the short happens along a main power supply line, the feed back will damage the power supply's voltage regulating circuits.
The way to test this would be to begin by pulling most components out of the system and bench testing the system using a new or known working power supply and just the basics. Here is a link to bench testing:
Sorry, but understand that this might be an expensive mistake.

You have to be a little bit crazy to keep you from going insane.

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