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It's not likely a power supply issue. I assume that you've tested the monitor and keyboard on another computer to confirm that they're functioning properly. The power button LED should flash a number of times indicating what the issue is.
That's likely to be a motherboard issue over a power supply issue. Unplug the computer, then pop off the side and ensure that all internal connections are secure. I always unplug and then plug back in.
If that doesn't do the trick, see the following troubleshooting guide: http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&dlc=en&docname=bph06739&lc=en&product=388428&tmp_track_link=ot_search#N105
you must measure the output from your power supply see the diagram attached in the box. If some Voltage like +5vdc is missing you must replace the power supply. If the Monitor NOT turn ON try to test in another computer more easy. or go to the repair shop.Use the bottoms from the monitor and execute from the MENU make test. God bless you
I see that you are having issues with you LCD monitor intermittently showing Video for a few seconds then just dies to a black screen and will show windows in the desktop then go back to a black screen again on the issue ...
I believe that what you are experiencing on the issue is a screen refresh rate setting in windows.
we will need to check you video settings on the system for the issue.
Before we go and change some settings on your system we will need to boot into safe mode first.
1. From Shut down as soon as you turn your system on keep on tapping the F8 key on-top of your keyboard, this will give you the Windows Advance Options Menu.
2. On the List Select Safemode once highlighted press enter once, a bunch o things will show up on the screen this means that windows is loading in Safemode and windows will be loaded but all drivers will not so may encounter a screen that has big Icons and letters on it which is normal.
3. Log-in you windows profile if you have a password setup, once logged in do the following instructions below.
Changing the Screen Refresh rate:
1. Right Click on your Desktop/wallpaper to get the pop up options menu, click on personalize.
2. In the personalize window click on display lower left side of the window
3. Then Upper Left side of the new window click on Change Display setting then on the next page lower right side you will see Advance settings click on it.
4. you will get a small window click on the monitor TAB you will see there a drop down for the Screen Refresh rate click on the drop down and select 59 Hrtz, then Click on Apply then OK to save the settings work on your monitor.
Believe it or not, it's due to a weak power supply. More specifically, weak voltage rail/s caused by failing Electrolytic Capacitors.
A bad computer power supply is about 70% of computer failure.
ALL the light use less than 1 Watt. EACH fan uses 2 to 3 Watts.
A processor uses 55 to 125 Watts. Depends on the make and model.
Since the power supply is weak, it doesn't have enough power to turn the processor on. No processor, nothing to find the Boot record on the harddrive. Nothing to get the Operating System going. (Example: Windows XP)
No computer running, there is no signal to the monitor. Just enough power to light lights, and spin fans.