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3 year old Dell desktop computer does not power down, fan keeps running and green light blinking. I am going to Start, turn off computer, turn off. I have unplugged the computer and started it up again, but for over a week now it won't turn off!

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Usually when a computer won't shutdown in WinXP it is trying to close many files. It sounds as if you have something hanging up and until you find the specific driver this will continue.
I would first check your registry with some type of utility like Norton Disk Doctor which checks and removes unused and garbage from your registry. This would be at least a first start to find out what is happening.

Posted on Jul 15, 2009

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Posted on Jan 02, 2017

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Contact technical assistance.They will most likely ask you to send it back to repair.

This chart is where I got my conclusion.

Power Light

Problem Description

Suggested Resolution
Solid green
Power is on, and the computer is operating normally. On the desktop computer, a solid green light indicates a network connection.
No corrective action is required.
Blinking green
The computer is in the suspended state (Microsoft® Windows® 2000 and Windows XP).
Press the power button, move the mouse, or press a key on the keyboard to wake the computer.
Blinks green several times and then turns off
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Check the diagnostic lights to see if the specific problem is identified.
Solid yellow
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If the Dell Diagnostics is running, allow the testing to complete.
Check the diagnostic lights to see if the specific problem is identified.
If the computer does not boot, contact Dell for technical assistance.
Blinking yellow
A power supply or system board failure has occurred.
Check the diagnostic lights to see if the specific problem is identified.
Solid green and a beep code during POST
A problem was detected while the BIOS was executing.
See "Beep Codes" for instructions on diagnosing the beep code. Also, check the diagnostic lights to see if the specific problem is identified.
Solid green power light and no beep code and no video during POST
The monitor or the graphics card may be faulty or incorrectly installed.
Check the diagnostic lights to see if the specific problem is identified. See "Video and Monitor Problems" in your Owner's Manual.
Solid green power light and no beep code but the computer locks up during POST
An integrated system board device may be faulty.
Check the diagnostic lights to see if the specific problem is identified. If the problem is not identified, contact Dell for technical assistance.

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Try these steps anyway just to be sure:

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