Unit powers on. cd drive will open, but nothing on screen. I tried external monitor,but no luck. I noticed to left of the key board there is a button that looks like the world and across from it a box with a symbol in it, just above the play and pause button. This seems to be able to turn on the power.
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Just try to power cycle the unit by removing all power sources (battery, ac adapter) and pressing the power button for at least 15 seconds. If this will not work and you did not get an image from the external monitor, then you need your motherboard replaced.
If screen and external monitor do not work then the issue lies with the video section of your laptop. The video chip is soldered onto mo bo and there is noway you can replace it if bad. Kiss your laptop sayonara, salvage the hard rive and memory and get yourself a new laptop that works. And avoid HP - their customer service is non existent after warranty runs out. They refer you to a forum or tell you to get another unit - an HP of course!
It would seem that your BIOS has become corrupted somehow. First try entering your BIOS setup. I believe for HP computers when you press power tap the F10 key until it opens. There you can try to reset them in some fashion and save. Try rebooting. If that fails then remove the battery and repeatedly press the power button for about 10 seconds.. (make sure it is also unplugged, this is to discharge the power from the system) then replace the battery and try booting again. Otherwise it would seem that you might have tried to load the wrong BIOS into your laptop. Check with HP then if you are still covered or not. :/
If it seems like you're accessing the hard drive (drive light comes on, flickers intermittently, then goes off, it's a good chance your screen is bad.
First thing to do is plug in an external monitor and start up the laptop. If it comes up with windows, you know it's the screen.
To find out if it's the backlight, or the lcd, toggle the monitor function and shine a flashlight on a slight angle to the screen. If you can faintly see what was displayed on the external monitor, then the backlight inverter is probably bad.
If the external monitor didn't come up, you're probably looking at a motherboard.
The good thing is that all of those are covered for one year under Compaq's warranty, on a new machine.
If you are able to use the external monitor, back up your data, because HP/Compaq usually reformat the harddrive. Additionally, if you've added memory, pull the cards. They want it sent back the way it came from the factory.
Because you have tried it on an external monitor tells me it's nothing to do with screen, inverter or backlight.
This because if it was any of the above you would still get a display on the external monitor.
It's either one of two things: faulty memory or its not seated properly. check on the system memory, clean the contacts and slots and make sure you seat it properly. if you have more than one stick of memory installed take one out and rotate them one at a time turning the laptop on in between.
If you still get nothing on screen then chances are that the GPU (graphics processing unit) is shot.
Have you tested the monitor? The monitor could be faulty. Try hooking up the computer to another monitor or another computer up to that monitor if possible. If the monitor is testing good then make sure all USB devices are disconnected and try to boot again. Then open the case and blow out any dust. Check the motherboard screws are tight. If the screws holding the motherboard to the case are loose it can cause a grounding issue. Then swap out the power supply with a working one and see if that fixes it. Disconnect hardware one at a time and re-boot. One of the devices...cd-rom,harddrive,ect could be faulty. Make sure the video card is fully seated and test the card in another working computer or test a working card in that computer. If it has on-board video then install a video card if available and see if it works. If none of these things work then the board is bad and needs replacement.