Compaq monitor blank screen

check your graphics card, is your monitor turned on?

Can you check the function buttons and make sure the primary display is set to show the output on the laptop. Try repairing your OS. If not then re-install the os. As you are saying till the time windows gets loaded, all works fine so it seems the issue isn't really the hardware.

You have identified your problem/fault by plugging in an external monitor and the image is OK. This proves the video card is OK and the fault could be the inverter or most likely the CCFL lamp.
The flickering screen indicated the CCFL lamp is faulty, it is a mini fluro tube which provides the back-light to the LCD. The inverter supplies high voltage to the CCFL lamp. It could be faulty and it is easier to replace.
For service, parts and DIY info check out LCD Parts - use this link to their WEB site : -
www.lcdparts.net

First instinct would tell me that your LCD has gone bad. A refurbished replacement LCD should run around $300-$325 give or take.

Keep us posted, good luck

God Bless

-Carlos:

Check the connection which links the CPU and the monitor. Also check the power cable of th3e monitor

Thanks
Nilesh

Unplug power cable from of the PC. Then hold power button in for 30 seconds, this will drain the capacitors, then plug back in the power cable see if this helps, if not could power supply, or video card.

did u replace the video card with the same kind of model ? i guess yes ... when system starts hit the f8 key and than go in to safe mode ... mouse wont work so use arrow on the keyboard .. and in the safe mode just log in to admin account if available or login to ur account and see if that still happens .. and if it doesnt ... remove the drivers for the graphic card from add and remove programs and restart the system and go in the normal mode and than install the drivers again ... and if the display disappears in the safe mode or u have install a different graphic card than ... reseat the memory cards and that should resolve the issue .... if that doesnt work out when the system starts hit f1 and stay on the BIOS screen for 30 mins if the system doesnt loose display than u need to reinstall OS ... that will surely work out ... the resolutions given above if u follow them correctly u will have a working system in no time

reboot the system by pressing F8 if your using windows OS and select last good configuration.

you can try also selecting Enable VGA mode (press F8 while rebooting and select ENABLE VGA mode).

hope this helps, please rate.

*check the power cables

*check the power outlet

*check smps is fine

*check power switches are properly connected

*check in bios hdd is enabled

*open the case wheather the connections are properly connected

Both of you, what did you do before the restart? If you changed anything while in Winblows it seems likely it is a software related issue. If you didn't, then a hardware issue is possible, in which case I'd start by unplugging the non-essential peripherals and restart. If that doesn't work, also try a different power supply and disconnect the battery. Sometimes a bad peripheral can cause the boot up sequence to hang. And correct me if I'm wrong, but I believe a weak psu can undersupply power to the harddrive causing the operating system to fail to boot. But, you probably have tried these ideas so they may not be of much help. Oh well, good luck!