Computer boots up shows windows xp and start up then monitor goes black if i switch it of and on it comes on for a couple of seconds and displays desktop then goes black have tried another monitor same thing happens it shows the start up screen and then goes blank and says no signal

This is a windows issue which will not support display boot in safe mode by hitting f8 key after post after your in in safe mode change settings in control panel till it works,if it doesn't work windows does not like your monitor.

You might need to change the screen refresh rate. Go do Control Panel> Display> Setting> Advance, choose 60 Hz. In order to make your Monitor able to display, restart the PC, press F8 on the keyboard frequently upon splashing ( 1 or 2 seconds after PC restarts). Select enable VGA mode by pressing up arrow of the keyboard> press enter. The display should look bigger, then you can start adjusting the screen refresh rate to 60 Hz

This PC was sold new day1, in 2009 (a bad year)
and as such had (per your manual) has toxic mercury CCFL background tube lamps at the LCD screen that do just exactly as told so very well.
and PC means Personal Computer
and CPU means central processing unit, a chip a USA invention !
when the screen is black we use the flashlight test (uk torch , burn free, lol.)
point it here.
see data the CCFL? yes, are dead and the do fail intermittent or by hot and cold room. or dead or dim or got yellow for white tinged.


the problem is bad hardware and googling finds endless geeks that do not understand hardware at all, or little (i call em bit flippers)
Too bad all makers of PC and monitors did not put screen test mode button on the PC, that glows the back lamps
in our shop we use HV CCFL tester to find that truth easy.

the monitor is bad on the desktop PC
if you test the monitor on 2nd PC it fails
if you the failing PC with known good monitor the PC passes all test.
now you learn 3 simple tests, of vast.
but in order based on AGE

big clue #2 is monitor newer showed its ERROR NO SIGNAL or NO connection error, so that clue means PC did not die the monitor did.
no signal , no connection, no sync, or over-range errors never seen.
fans normal. blowing. in PC is clue 3 (and all LED you told too)

This may be because the resolution that is set in your user profile when you log on has been changed to a resolution not supported by the monitor. The best way to fix this is by going into Safe Mode (press F8 as the computer starts to load Windows) and change it to a lower resolution once you get logged in. 1024X768 is a pretty safe resolution to start with. Then restart and see if that fixes the issue.

budged electrolytic capacitor nearby high voltage transformer. 220microcarad/25Volts. apply fresh solder and re-connect lamps.

If tried the monitor on two other computers with the same result -- definitly your monitor is faulty. Take it to the repair shop. To make double sure, run your computer with another monitor. If everything is fine now; you can blame the monitor.

It appears that the display resolution set in your display properties is out of the range that the LCD can display.

Try this.

Boot to the ENABLE VGA MODE by pressing F8 to get the Windows Boot Menu. If you can get to the desktop, then go to display properties, and see if you can change the resolution to higher settings and maintain video. (If the video blanks out, then it should revert to the previous setting in 15 seconds)

You can email [email protected] and provide your telephone number... he will call you to assist.

Same problem here. Does anybody have an answer?