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Try plugging in another working monitor into the monitor output - if results are the same then the problem lies with your video circuits in your all in one. Hopefully it is under warranty - if not you are screwed because those all in one units have nothing but proprietary parts and are very costly to replace/service. If the external monitor works fine then the problem lies with the display or screen of your all in one.
first check the buttons on the front of the screen, maybe one of the buttons are pressed on that why it shows the contrast menu..just press all the buttons on the button panel maybe one of the buttons is stuck of defective. if defective replace anew one.. if stuck just clean it with a contact cleaner.. hope this may help you
exchange your dell monitor to gateway monitor.If the monitor from dell showed the same problem when you connect it to gateway. you must install video card driver. and if the monitor from gateway showed the same problem when you connect it to dell adjust your contrast to full and the brightness to 50% and adjust the colors to 100%
Take the reinstallation CD and boot from it. Then click R and It will ask what drive you wish to enter. hit the drive number you wish to enter. It will give you options. Once your in type fixboot. just as I have it and it will ask you if you wish to rewrite the boot sector. Hit Y and press enter. Then type exit and it will reboot. If that dosent work you will need to do a repair install. I will walk you through that if we need to.