Question about HP Pavilion Media Center TV m8400f Desktop, Phenom 9500 Quad-Core, 30

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Monitor immediately goes to sleep. Tower shuts down from unplugging it.

The tower will start up. Monitor immediately says "monitor going to sleep". Screen goes and stays black tower will not shut down from power button so I have to unplug it. Is this a power supply issue or motherboard issue? A few of the capacitors are dis colored on the motherboard. Hate to buy motherboard and it not work, do not have a multimeter. Hoping by what I described you can pinpoint the issue?

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  • Amy W
    Amy W Apr 09, 2015

    Additional info. I have tried another known working monitor and got the same msg "monitor going to sleep". Have reseated graphics card and RAM. Still same results.

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  • HP Master
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Have you tryed starting up in safe mode to see if you can get into your windows?

Posted on Apr 10, 2015

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Now make sure the power cable of the monitor should be pluged in and the power cable of the tower should be pluged in.

Now to check if the montor is fine just unplug the video cable only which will show no input signal on the screen. If it shows this signal the monitor is fine. Plug back in the video cable.

If the monitor is going to sleep mode it might be possible that the old computer ( Compaq Presario 5103 CL ) is in stand by mode. hit any key on the keyboard and it should come back .

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Then you need to open the tower and check on the processor FAN is it running..? If its not running you will not get the display as the fan is responsible for the display on the screen. Otherwise...!

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