Black Screen Dell 600 Laptop

You might like to Power it off completely by removing the Battery for a few seconds.
If that doesn't help, try booting from your Win7 Installation Disk.

turn on your computer, and while its booting up, keep pressing f8 till you get to the dos screen, and choose safe mode. lets try to run your pc on safe mode

This could indicate that the POST test is not completing. Do you have any beeps?This could also indicate that Windows is not able to boot. Hold down the F8 key when the Dell logo appears. If you see a screen asking for Windows boot options, select Safe Mode. If this works, you will need to revert to an earlier system restore point.

Immediately after seeing the Dell logo, keep tapping the 'F8' key,
until you see a "menu" (white text over a black background)
giving "startup" options for Windows XP.

Select "Safe Mode" and see if you can start in that mode.
Then, use "System Restore" to go "back" in time, to the most-recent checkpoint (date/time) where your computer _DID_ work.

Restore to that point, and restart.

When you say screen goes very dark when it booted to windows so it means that when you turned on the laptop when the dell logo flashes the screen was fine? if thats the case could you please try this. after turning on the laptop you will see the dell logo flashes immediately keep tapping on F2 and then it will show you the BIOS setup utility, please check if in BIOS setup display goes dark as well. If yes then try this, after turning on the computer when dell logo flashes keep tapping on F12 to boot menu then select utility partition to run the diagnostics. Please run test on the LCD check if display goes black when running the LCD test. Then try this when you sees the dell logo keep tapping on F8 to boot in safe mode check if in safe mode display goes very dark. Try this too, boot in F8 then select last known good configuration check if the settings on your display will be fix. If you can boot to safe mode no problem then uninstall the display or video driver. then restart computer.
You can also try to connect an external monitor if you have one just try to isolate if issue is on the LCD or the video card. If the display is dark as well in external monitor then video card needs to be reseated if fails then replaced. In situation like this most video cards is integrated to the motherboards. So replace motherboard.

When you see the Dell logo, it means the system is booting and you see the splash screen that is generated on the motherboard.
Apparently this is where it is stopping.
Here's what I would do: First when you boot the computer, press F12 to get the boot options. Choose the diagnostics and run the system diagnostics.
You can also try to press F8 to get the computer into safe mode, but I'm thinking if you see nothing other than the splash screen, that may not work. If you are presented with Windows boot options, choose safe mode and do a system restore.
The last thing you can do if you have the Dell system recovery disk is try to do a repair from that CD if it allows you to do so.

The screen goes black while in normal mode right? So try to boot in safe mode (power on then keep tapping F8 then select safe mode). Check if still happens in safe mode.

If screen does not goes black in safe mode it means there might be a software or driver causes problem when running in normal mode. You can try the following (update your anti virus software then run a full system scan, uninstall the video driver then download and install the latest one, uninstall any previous windows update or you can system restore to the time when it was working fine).

If the screen goes black even in safe mode they try connecting the laptop to an external monitor if still goes black, if yes then absolutely no issues with the LCD panel. You can try (uninstall and reinstall the video driver if still persist then this might end up replacing video card or motherboard, but before doing that update the BIOS first).

If does not goes black in ext monitor then the LCD panel might causes the problem. Reseat the LCD cable or inverter if you can.

ok after you have booted in safe mode do a restore to a date just before the last day it worked properly and try that restore is found here

start/programs/accessories/system tools/system restore

hope this helps

plz try to boot through safe mode, if you can then log in normally.
if you cant boot from safe mode then you have to reload or repair your os.

sounds like an unhappy hard drive..can you try F8 when it starts to boot, before the logo hits the screen, that takes it to SAFE mode. try the last known good configuation option, if it is there. otherwise, safe mode

then do disk clean
defrag
and then restart.