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Computer shows no output


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#1 ratm

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Posted 09 August 2010 - 11:06 AM

I was given a computer to scan for viruses, something I thought would be fairly simple. But when I plugged the computer into my monitor via VGA and attempted to boot it, nothing showed up, no BIOS or anything.

I know the computer worked just last night and that it is still booting into windows. I can tell because if I give it enough time to boot I have to hold down the power button to shut it down as opposed to quickly pressing it while its still in BIOS.

I have tried EVERYTHING I can think of.

I've reseated the RAM, tried the S-Video output on the computer, tried reseting the BIOS, tried a different monitor with a different cable even though this one works with other computers, checked every connection I can think of.

I'm at my ropes end, any ideas?

Also the graphics card is integrated, the S-Video isn't. There is also another dedicated graphics card which only has DVI on it.

Please let me know if you need any more information. Thanks

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#2 computerxpds

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Posted 09 August 2010 - 11:17 AM

Try the dedicated graphics as most computer with on board graphics usually shut the onboard off if it see that a outboard is in.

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#3 MrBruce1959

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Posted 09 August 2010 - 12:08 PM

Hello and welcome to Bleepingcomputer.

By reading your post above I believe your saying this computer is still booting up, you probably hear the one lone system beep code indicating system is Okay. (If I am wrong please correct me)

What you are describing is the computer is booting but there is no video on the screen.

I would suspect a video port (VGA port) malfunction. In other words there may be a faulty solder joint where the VGA port connects to the circuitry of the motherboard.

Jiggling the connector may show a brief sign of monitor activity, or non at all, being that your BIOS beep codes are not indicating a video accelerator error, chances are the on-board is working, but not sending the signal past the motherboard connection to the video port.

You may have to gain access to the motherboard bottom to look for a loose VGA port connection lug, which is usually soldered on the bottom of the motherboard, jiggling the VGA connector port slightly, might reveal a loose connection.

If this is the case, you can correct this by re-flowing the connection using a grounded tip solder iron used for electronics repair, DO NOT use a wood burning tool!

Please post back what you discover, I'll monitor this thread in case you need further help or assistance from me.

Kind regards.

Bruce.
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