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I assume your screen is completely black and maybe doesn't show the flashing cursor? It could ether be the graphics/video chip at fault, or a hard drive or motherboard fault. It could even be the screen itself. Does it sound as if your laptop is actually booting up, even though you can see nothing on the screen? If you can, connect your laptop to a computer monitor (a cable will be required). If your display works on the computer monitor it's probably your video/graphic chip at fault. If the screen is still black after connecting to an external monitor the chances are that it is a hard drive or motherboard fault. Don't rush off and buy a replacement hard drive and motherboard. It makes more sense to take your laptop to a shop, pay for an inspection and they will tell you exactly what the fault is.
Open it again and make sure you connect all the devices and such ..It seam to be like a clear case of a disconnected cable ..If the system boot up ..and seam to run ..try to see if the vga secondary monitor brings anything to a screen ..if it does it means you messed up with the monitor connections ..cause you changed the hard disk ..you don't have a operation system to boot into and try to make an idea..but its a start .. Other things to check is the fan connections and cables .. If the screen is totally blank I think is like I said just a bad connection to the monitor or a damaged cable in the process of opening it .In any other case you would have at least a warning on screen even without hard disk it should boot to BIOS ..
That usually happens when the computer is booting up from another drive other than the hard drive... Try pressing delete when the computer start then make sure that hard drive is selected as the primary..
If you are interested in solving the problem more easily and quickly. I think you can try this computer boot up suite, a boot CD and several other data rescue tools that help get your PC going even if Windows won't start or computer won't boot up at all.
If the unit has a place to connect an RGB monitor, try that and see if that is working. If that monitor works, you probably lost the invertor that drives the CCF lamps that backlight the screen. This is normally not a DIY repair.
if the monitor led indicator is amber and and the hard drive (usually red) indicator on computer is blinking red. that means your computer is working but onboard video is dead. if under warranty, bring it back for replacement or repair.
just had this experience myself on a smasung monitor. I originally thought of power management but Samsung assure me it is a monitor sync problem and have yaken it away. Theyhave replaced the monitor. So conclusion is that your monitor is also in need of repair
check both your power and video connections to the monitor, sounds more like a monitor power issue.
if the connections appear ok, but screen still blank, try connecting a known good working monitor from somewhere else and see if it works with your pc, if it does, your original monitor is faulty, if it doesn't, you have a pc video issue.
basing on the information you have given here are the possible solutions:
remove any external device connected to your system (printer, external hard drive and others) if removing this does not work and still gets a blank screen with blinking cursor try to go to safe mode with networking. if successful try to download the driver for your video adapter.
when you try to start the computer , do get anything on the screen like a logo? when does the blank screen occurs, is it during the turning ON of the computer or during the windows xp logo appears on the screen?
a blank screen could be caused by the following: defective video adapter, corrupted video driver, defective memory, unknown device causing the issue like the hard drive, optical drive or other peripheral installed inside the computer.