Question about Dell Optiplex 755 Desktop Desktop Computer

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The monitor is working but is showing as a black screen

I work in a school and a child was messing around with the keyboard on a dell 755 and has managed to blank the screen- when you initially turn it on the normal screen shows and then it turns blank. I know how this can be done on a laptop but I have never seen it done on a pc - it is probably a simple key combination. Please could you help.

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Hai there

i believe this will help you to solve the prolem, make sure you pc is off open your case and remove a RAM from the slot and take it back again where it was on slot 1 [DIMM 1] and swicth on your pc
if mouse is giving you a problem download mouse drivers from dell company

Posted on Jun 25, 2009

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For my brother also happened same check the monitor wire

Posted on Apr 21, 2009

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Posted on Jan 02, 2017

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Welcome to the world of Windows 7. Don't you miss Windows XP? LOL, Windows 7 is a nightmare just like Vista.

Anyway I think it's your Memory. You mentioned moving the memory chips around, but you didn't mention trying one at a time. I think one of them is bad.

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Oh, I just thought of something else, Maybe you have bad Capacitors on the motherboard. Remove the Power Cord, Remove the Case. Take a flash light and look inside the computer at the capacitors. They look like little Battery Towers. If any of them are spewing corrosion out of them, they can cause the computer to go crazy just like yours is doing.

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