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Tower intermittently loses power

My tower loses power and I can't seem to figure out why or what to do. I don't have to be using the computer. It can be turned on and not in use and and will suddenly turn off. The only way to get it working again is to unplug the three-pronged plug from the back and then plugging it and unplugging it until it comes back on. Sometimes this has to be done more than a dozen times. I tried the method on the power strip end, but that seems to have no effect on it. The only time it shuts down consistently is when I run a full Norton scan every Friday. Each time about 20 minutes into the scan it shuts down. I don't want to invest in any new cords, etc. until I'm pretty certain what the problem is. Thanks. shortly after bootup the hard drive lose power, the power on/off led blinks, the monitor shuts off, the hard disk led lights are on constantly. pressing the power off button doesn't turn the pc off. what i do was to move around the tower case's wires by pulling and pushing it lightly, then the pc begins to boot normally. the problem occurs at different time intervals shortly after a normal boot and sometimes while booting. which causes the problem?

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  • jrbodkin Feb 02, 2009

    I have a very similar problem with Dual 1.42 G4 (FW800) where the system crashes after the screen lighting, the chimes sounding and then crash. I usually disconnect the cord at the back, reset the MPU and remove/re-install the battery and then try again. Can happen multiple times (one time started normally after 31 times, another still did not start after 80 times) Many times just removing the cord will allow it to restart. Last two times, the only way to have it restart is to completely remove power for a couple of hours and then restart as before. When it is operating now, there is a slow throbing hum coming from the unit. I don't know whether to replace the power supply (it is working at the moment), replace the battery again, or look at another failed component such as the front panel board. Any suggestions?? Please!!

    Thanks, Jim jrbodkin@comcast.net


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I think you have a problem in you power supply sir try changing it or try separating your monitors source of power.

Posted on Dec 10, 2008

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