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Computer won't remain on after pressing power button

I have a Gateway 550GR that I am having a strange problem with. I installed a hard drive from another computer that I had that died to get some info off it. It has two slots for SATA drives. I removed the DATA drive, plugged in the hard drive from my other PC, unplugged the boot drive, and booted into windows. No problems.

This evening I had to move it back to its location, so I replaced the original hard drives, moved it, hooked it up, and now when you hit the power button, it doesn't remain on.

Upon pressing the power button the fan in the case and the CPU fan both come on, as does the blue LED for the video card. But as soon as you let go of the power button, everything shuts down.

Also, the hard drive light under the power button blinks when you press the power button down.

Between the time that I replaced the hard drives and moved the computer, nothing abnormal happened. No drops, no shocks, no pulls or pushes. Everything went fine.

Any ideas?
ComponentsStorage HardwarePC

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it must be power supply problem try removing all the power connectors and replug it firmly remove the power switch cable on the mobo and try to switch by shorting the PW SW prins on mobo if it works fine then the on/off switch on the cabinet might have gone faulty or might have gotten struck so press it swiftly two three times so that it will come out
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well - you cannot hust swap disks like that; normally with different hardware, you need to run a repair install at least. My guess is that the first time, drivers were updated but when you placed it back it uses the wrong ones.
see here for how to do it :

http://www.michaelstevenstech.com/moving_xp.html                  Moving XP
http://support.microsoft.com/kb/249694                                "         "   

Components are those devices that are internal to a computer -- the PC boards, the central processor (CPU), the memory (RAM), disk and video controllers and so on.

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