Question

Everything Connected To My Computer Doesn't Work

Recently i replaced my cpu fan to a water cooling system and now every time i turn on my computer everything connected to it (monitor keyboard mouse) will not turn on or connect to the computer

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Re: nothing works

Does the computer itself turn on (fans, LED's, hard disk rotating)?

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Yes

yes the computer itself turns on

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.

I put my new cooling system back in place and now my computer mouse turns on for a second at luanch of my computer but turns off after

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Answer
A classic method to find out if it's the new parts.

Is to go back to when it worked.

That said the installation of a water cooler is not trivial. You didn't tell much about the system but some are finicky about the CPU socket area and you will kill a PC over such a change. You take it back to the condition where it worked and since a water cooler is rarely called for you leave it with a normal cooling solution.

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I did

I did but it still wouldn't work

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The quick power off after power up

Is usually a sign that something shorted out.

Again, no PC details so I'll share my generic method to find out what parts have failed.

I start by unplugging any part I can in the case. We don't need drives, floppy, memory or any cards. What happens next determines our next move.

1. Powers up.
Start adding one part at a time to see if you can find Waldo.

2. Does not power up.
Out comes the motherboard onto cardboard. We put a power supply on it and test outside the case. Again the test result tells us our next move.

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Why details matter.

If this is one of those old exposed core Athlon CPUs they can crack often at the hands of a new tech. New techs don't know how to treat such a CPU (with care and never tighten down those heatsink screws!)

There's also machines we see that the case shorts out as the owner changes things. That cardboard test usually finds that issue.

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Likeliest cause

The likeliest cause is that you have your water cooler plugged into the wrong motherboard jack and its interrupt is interfering with your USB drivers. Try plugging the water cooler into some other fan jack.

If that doesn't work, try reinstalling your USB drivers.

DO NOT JUST UNPLUG THE WATER COOLER!!! Someone recommended that in another "answer" here. If you do this, you will fry your CPU in seconds.

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