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Either your monitor or the video card inside the computer is going bad. To isolate the problem connect another monitor to the computer. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the computer. If the Borrowed monitor displays ok that means your video card is ok, but your original monitor is bad. If the Borrowed monitor displays the same blue shade then your video card inside the computer is bad.
You may have files that you want to keep that you saved on your hard drive, but if you haven't backed them up then you will have to lose them because the only thing you can do to fix this is use the factory recovery disk which will wipe your hard drive clean.Just put the disc into the disc tray and you should get an option to start the recovery disc when you turn on the computer, it will tell you to press a key to start it which might be f3 or something different, I'm am not sure what key but when you have done that you should be able to start the recovery and wipe the hard drive clean and it should solve your problem
All the colours on the screen are created by "mixing" the 3 "primary" colours (red, blue, green).
Once the production of "green" ceases, anything that should be "100% green" becomes "100% black",
and every colour that indicates some percentage of "green" becomes a mixture of just RED and BLUE, i.e., various shades of PINK.
First, try the monitor on another computer (desktop or laptop). If the problem persists, it's time to replace the monitor. If the problem vanishes, it's the video-card in your computer that is not generating GREEN, or it is the "data" cable between your monitor and your computer that is not transmitting the GREEN request. So, you can try replacing the data-cable, or try replacing the video-card.
Do this to check if your monitor is in working state or not...!
Step 1:- Turn on your computer.
Step 2:- Unplug the Video Cable of your monitor which is connected with the computer.
( Video cable:- Cable going from the back of your monitor to the back of your tower. It has a plug with two screws on the plug ends, which you can unscrew to unplug it. Thats how it looks like. Some times it is in grey in color some times in blue.)
Step 3:- Now check on your monitor. If the display says " No Input Signal " :- your monitor is fine. Some thing wrong with the computer graphics.
If there is not display and the monitor light is blinking or solid the monitor has gone bad.
( Note :- Remember when you unplug the video cable do not unplug the power cable of the monitor. )
This is a common problem with this dell brand for some reason. i have replaced many motherboards on this model and im afraid the tech is right. i would go with a non factory brand of mother board. it will work best. i think this is a manufacturing flaw in the dell brand motherboards.
It is entirely possible if the CPU fan was not operating properly, the CPU may have overheated and subseqently failed. As for the proper CPU, if you go to ACER's website and enter your computer specs, it should give you the processor that came with the computer.