hi guys I have a problem with my sister optiplex 790 the problem is that the computer dont show image in the monitor but light in the cpu turns on and you can feel that everything is working btw like 1 week before this problem the computer showed a fan failure and run a diagnostic that showed this: "error code 2000-0511 validation 92045 the processor fan failed to respond correctly." ;my sister told me that she notice that the computer fans suddenly change to max speed just 15 min after turn it on, the next day I decided to clean the fans with air then everything go back to normal until yesterday the computer stopped showing image please help!![:'(]
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