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Dell Optiplex GX520 PC - monitor goes off after a couple of sec

I have a Dell Optiplex GX520 PC and, last week after turning on my computer, the monitor started flashing and then went black but, the power was still on. if i turn it off and back on again the image reapear for only a couple of seconds and then goes black again. i have a good anti virus but, as i was reading other comments, i believe it could be a worm or virus as i get into websites that could be full of junk.
If the problem is virus/worm related, are there any solutions for this? can i do something myself or do i have to take it to someone? many thanks

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  • martha_doria Sep 05, 2009

    hey again, and thanks for getting back to me. the PC is loading ok, no problem there as i can see for a couple of sec my desktop (i have to keep turning the monitor on and off to see). Keyboard and mouse all working fine. As for your question about the power for the monitor, is on operation mode (green light). i've just checked the monitor in other computer and is doing the same, goes black after 2 seconds i turn it ON. i'm starting to believe it is the monitor now.



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What exactly is the image you see?
is it the bios loading?
when you say the power is still on...
is the power for the monitor on in a)stand by mode ? (usually yellow/orange light) or b) operation mode (usually green light)
what happens to the cpu? is it running properly with all power lights and hdd lights (red blinking light usually) on? or it shuts down as well?
If your CPU tower is on, are the keyboard's numlock/capslock/scroll lock lights on? Try pushing these buttons to see if the correspondent lights in the keyboard are working fine.

could be for:
a boot sector virus (low probability)
a wrong / corrupted ram chip.

Would be helpful if you could provide some more information or call in an engineer.

Posted on Sep 05, 2009

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  • shadowarrior
    shadowarrior Sep 06, 2009

    she tried hooking up the monitor to another rig, and faced the same problem. so i would cross out options of any OS/Software/related hardware faults.

    If the monitor just stays on for just 2 seconds I don't think she can login to safemode.

    If the resolution is out of frequency for a monitor, then usually it displays the 'out of frequency' floating message on the blank screen, or goes on stand by mode.

    I rule out graphics card error/loose monitor wire connections since she hooked it up in another rig and had the same problem.

    It is not loose power/data cable of the monitor externally since it does have 2secs of display when you start your computer.

    After eliminating all the possible causes, I think you are right about the monitor gone bad. Seems like it can't retain the data signal from the computer. You could try calling in an engineer if the monitor is still under warranty, else, its time for that nice LCD you have been thinking about lately. :)


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Hate to say it but i have the same problem with my monitor. The olny way i can get iot to turn on is to unplug the lead from the monitor wait 10 sec for the computer to get past its POST checks plug it back in wait for windows to load and walla you will have a very poor resolution. I know its not a complete fix but should keep you computing till you get a new monitor.

Posted on Sep 16, 2009

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Did it happen after there was some type of computer update? Maybe a windows updated something or maybe a videocard/motherboard update. Does it do during the bootup phase of the computer or only when the operating system loads? You could press F5 when the computer first fires up and this will bring up a menu. Then try booting in safemode and see what happens. I f safemode comes up ok you could try using system restore and try going back to a date when the monitor worked. It could also be that the monitor has gone bad or motherboard video or video card. Also the screen resoloution may have change in windows to a resoloution that is not compatible with your monitor. The F5 selection screen has the option to boot windows in low res mode you can try that also.

Posted on Sep 05, 2009

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