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Restart your computer and then press and hold F8 keys until you get Advanced Options menu screen.Use the arrow key to highlight Safe Mode, and then press Enter, your computer will boot automatically to safe mode.
If you able to start in the safe mode then Scan your computer for viruses. Some viruses can cause a black Screen , especially ones that infect the master boot record (MBR) or boot sector.
Update drivers for your hardware. black Screens are hardware or driver related so updated drivers could fix the cause of the STOP error.
Return BIOS settings to their default levels. An overclocked or misconfigured BIOS can cause all sorts of random issues, including black screen.
If it didn't helps you then simply get the system utility program like PC Fresher that will fix windows errors that cause of black screen screen
Do you see the cursor blinking in the black screen? Try booting to safe mode. Restart your computer and tap F8 until you see the options to boot to safe mode. Use the arrow keys to highlight safe mode and hit enter. Once you are inside safe mode, install RadarSync and scan your computer with it then update the outdated drivers.
It would be helpful if you posted the Make, Model and the OS you are using. Does it boot? Can you boot to Safe Mode? Have you checked ALL cables? Do you get anything on the screen? Fans spin? LED's Blink at boot? Sound? Need more info.
The picture board on your monitor is bad, since it goes
off after few seconds and the power led or button is on, it means the
board of your monitor has developed fault.
The best thing for you
do now is to take the monitor to a local repairer or service center
within your vicinity
to help with the replacement of the picture board
because the fault is not something you can fix yourself, in order not to
Turn the computer off and then disconnect any external devices connected and then when you turn the computer on or as son as you press the power button to turn the computer on start tapping the F8 key repeatedly until you get a black screen that says advance boot menu option .Then used the arrow keys on the keyboard and then hit enter,select the operating system and then when you get the log on screen select administrator .If it takes you to the desktop then you can try doing a restore by going to start ?all programs ?accessories?system tools and then system restore ? select the date when you think that you r computer was working fine and then click on next next to exit from the wizard.Should fix the issue .
If the computer does not boot up to the desktop then without wasting time on any trobleshooting steps recovery needs to be done that takes the computer back to its original factory settings.To do this instead of the f8 key tap the f11 key till you get the screen that says system recovery ,click next until you get the screen that has advance option ,click on it ?select destructive recovery ?click next the recovery will start and the computer will be formated (whatever you have added after you bought the computer would be lost ).If the recovery does not work this was then it needs to be done from the recovery disks and fot that you call call HP...
start off with the pc off then turn it on wait till the bios etc splash screen show past the hit del or f2 to goi to setup then after that press f8 repeatedly until it shows some sort of list this is the alternate boot up just scroll down to ENABLE VGA MODE after selecting that it will boot up with your screen.. hope that works