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The OptiPlex 755 is an energy-efficient desktop computer designed for businesses. It was released in mid 2007.

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Computer reads no input on screen.

Computer is always on and the screen reads no input. The only way to turn off is unplug the computer

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Hi,

Does the screen ever work properly? Have you checked the monitor cable is properly connected at both the monitor and PC end? What have you tried to do to fix the problem?

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Yes tried all those things. The on off switch will not turn the computer off. It will turn off if held in but when released the computer starts up. Have to unplug it to turn it off. When on, black screen with "no input signal" appears. I have another computer and plugged this into all the connections, It still does the same thing so all the input cables work.

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Hi What OS is installed? Can you get into the BIOS setup? Can you start in 'safe' mode'?

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Hi,

Have you seen this link regarding Dell Optiplex 755 shutdown problems.

http://rtr.ca/optiplex755/

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