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Depending on your version of windows, I would trying starting in safe mode to see if the computer does boot. If it does, then you want to restart again, go to advanced boot options and select "start windows with last known good configuration." Access advanced boot options following the steps at this link. Need to Start Windows 7 in Safe Mode Here How
do you still see the compaq logo and does it show you the windows boot up screen before it goes blank?
do you see anything on the screen at all after pressing the power button?
Check if the laptop is receiving power. If it has power and you can't see anything on the screen it could mean that the LCD assembly or the Video card of your laptop is bad.
If it goes to the compaq screen and then to windows logo before going out, try booting into safe mode and once there uninstall the video driver from the device manager because that means the resolution was set to something higher than the display could handle.
If it restarts after showing the compaq screen try reseating the memory, hard drive and wireless card of your computer put them one by one and try turning the compter on after each part you put back to check which component is point of failure.
Otherwise you have a bad motherboard and it may have to be replaced.
Hope this helps!
Remove the AC power (charger) and then take the battery out. Plug in just the AC power supply and turn the laptop on, see if it boots up and shows a display on-screen. If it boots let it boot up and then shut it down as normal. Reinsert the battery and try as normal. If you still get a blank screen can you then tell me if you get any post (splash) information like the Compaq Presario logo before it goes blank.
I think that has to do with the BIOS if it cant boot compeletly. Try pressing the key indicated to enter into SETUP if you cant just try and look for a jumper on the motherboard that is written CMOS it may be a button or something.