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My computer turns off without warning

I am using windows 2000, I have an msi MB, AMD sempron processor. 512 Megs of RAM , Comodo firewall Fixit utilities for virus protection.
My computer turns off like some others have complained but when mine turns off it does not turn all the way off. The monitor goes black and the mouse pointer gets bigger. Keyboard and mouse will not function. System and fans are still running just no resonse from HID. I have to hold the power button until it shuts off and then reboot. I don't think it is an over heating problem since it sometimes does this just a few minutes after I boot it up. I checked my MB in the bios and it shows temps well within safe range even after running for several hours. Once I reboot it does not usually happen again during that session. It only did it again maybe twice. I opened case and checked fans and cleaned out dust anyway but to no avail. Does anyone have any idea what may be going on? Any suggestions greatly appreciated Thank You!

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Since those temps are

In reply to: My computer turns off without warning

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Thanks for your reply

In reply to: Since those temps are

Thank you so much for the information. I am glad to know more about cleaning my machine and the capacitor issue. I checked my capacitors closely and they look healthy to me. I had already cleaned out the dust and checked my connectors. Everything appeared to be in order. I think I may have solved my problem to some degree. I went into the services applet in administrator tools in control panel and when I inspected the entries there I noticed a service called "LXCFCustomerConnect was set to automatic, but it was not started. I right clicked and clicked start to get it running and the computer did not do the black screen thing at all. Now my problem is how to get it to start by itself as I am sure it must be supposed to do. Everytime I boot up, I have to go to services and start that service . When I do that the computer works fine the whole time I am using it.

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In a batch file.

In reply to: Thanks for your reply

You can try

NET START LXCFCustomerConnect

In a batch file that you put into your Startup group. Since this is Windows 2000 you know what to do next.

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