I closed my computer maually after a bug then put it back on. My monitor is still black.

Try another monitor on it to verify it is the video card that has gone bad. If it does not work with another monitor then that is the likely culprit.

may you just uninstall the first video card driver & monitor driver, & then install it again..

please post back & let us know here, how things done..

Thank you

maybe you have defective parts in oscillation circuit! in hotside of the power supply! or maybe you have loosed contact at the main board!

satservice, What happens AFTER 15 min of FLASHING?? What did unit do or act like 3-4 weeks ago? Is the screen both BLACK and BLANK? or is screen just black and you can SEE win-desktop if you shine a bright flashlight 1 inch from screen at differnt angles? Can you use your Samsung warranty? Will monitor do same when connected to different KNOWN GOOD prebooted to desktop PC? Are you refering to the "power ON" indicator light on front BEZEL as the FLASHING thing? Need more info, but I suspect "shutdown of units "switch-mode-power-supply" due to detection of FAULT CONDITION having been detected with other circuit or with itself. Read some of my other responses in my fixya profile that deal with BLACK SCREEN repair. If this response useful, rate on fixya. 12fixlouie

ive been having this same issue with my fone, have you not found any more information this problem ?

try to positioning well the video card inside the cpu,it will help you a lot,

You will probably have to repackage and resend the monitor back for repair. sounds like a manufacturing mistake or bug.

HP's are known for bad capacitors in the power supply.
Replacing them is simple if you know how..not so simple if you don't.
Try your local TV repair centre. It should not cost alot to have the capacitors replaced.

Hope it helps =)

see there is power in monitor and check also that your monitor is getting signal from cpu just remove the data vga data cable from cpu and see is it showing any massage on screen like check signal or any other massage. and check your keybord also by pressing num lock key see the light is on and aoff when you pressing the num lock button . if nothing is happen that mean your monitor is not getting signal from cpu and it is not monitor problem bye

sounds like a slightly damaged power supply. try powering up with an equivalent supply. if only an ac wall cord is plugged in for power, then internal supply is at fault