Blank Screen is one of the most common failures we meet when we use computers and now let’s talk about more about such kind of phenomenon.
You receive a blank screen when you power up your computer or right after the P.O.S.T (Power On Self Test) completes. Perhaps you may also have received the blue screen error messages while working in Windows.
What causes the blank screen?
The possible causes can be a hardware problem or a BIOS setup problem. Your computer hardware has not been installed correctly, your motherboard’s jumpers are set incorrectly, your BIOS settings are not correct, or your computer or peripherals have been shorted out and/or have some other mechanical problem.
How to handle the blank screen?
Depending on situations, it could be a fairly easy problem to solve. Some times you only need to revert the changes that you have made. If you can’t remember the values you have tweaked, it’s recommended to reset all settings to default value.
The remedies below should be performed in order. Turn off the computer after each step. Never work inside the computer case with the power turned on.
1. Check and make sure all cables are firmly attached to the back of the computer and to all external devices. Retry.
2. Remove the case cover from the computer. Make sure all cables (hard drive, power cables, other disk cables) inside the computer are firmly attached. Press down on all ISA and PCI cards and make sure they are firmly seated. Make sure your DRAM memory cards are firmly seated. Feel the top of the CPU and make sure it is not hot (warm is OK). Retry.
3. This step is only for newly built computers that have not successfully booted. Get out your motherboard manual, or download one from the manufacturer’s site, and go over all your motherboard jumper settings. Set the jumpers in the most conservative position. Review all your accessory wire connections (keyboard lock, hard drive access light, etc.) and make sure the connectors to the motherboard are facing the same direction. Retry.
4. Turn the computer back on with the case off. Verify that your CPU and power supply fan are running. If either one is not running you have a problem. If the power supply fan is not running replace the power supply (make sure the power connectors are correctly attached to the motherboard). Make sure the CPU fan is connected to power on the motherboard. If it is correctly connected and still doesn’t run, replace it. Retry.
5. Unplug your computer. Remove all PCI and ISA cards. Reinstall the video card and disconnect the hard drive cable. Plug in the keyboard, video cable, and power cable. Restart your computer. If this worked, go to Step 6. If your DOS screen doesn’t come up at this point try the following ideas.
* Closely examine your motherboard and make sure it is not making contact with the computer case, which will short it.
* Your video card, video cable, or monitor may be malfunctioning. Borrow a video card, cable and monitor, retry.
* Remove and reinstall your DRAM. If your computer can not find system memory it will not POST.
* Remove the CPU and reinstall it.
* Follow your motherboard manual’s instructions for resetting your BIOS to its default configuration.
If your computer still will not boot into a DOS screen, seek professional help.
6. If you now have a DOS screen on your monitor, attach your hard drive cable and reboot. Make sure the hard drive is correctly set up in the BIOS. Press the Delete key during the POST memory check to enter the BIOS. If your hard drive doesn’t work, you have incorrectly attached the drive ribbon cable or power cable. See our article Installing a Second Hard Drive for the correct procedures for installing the hard drive ribbon cable.
7. Add your other PCI and ISA cards back into the computer one at a time. Reboot after each card is installed to make sure the new card isn’t causing a problem.
In certain cases when you receive a completely blank screen when you power up your computer, and therefore do not have the option to enter the BIOS, you may have to do so by manually resetting a jumper on the motherboard to revert the BIOS values to default. Jumpers are generally small plastic plugs that contain a metal bridge to join two or more connecting points on a printed circuit board. Before you start, ensure that you have your hardware manual ready with you. Alternatively, you can always search for instructions on your manufacturer’s website. Lastly, be sure to observe all safety precautions!