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sure it has power (ejects). Check Device Manager in Safe Mode by pressing F8
during boot. Right click My Computer > Manage. Select Device Manager >
View > Show Hidden Devices. Now delete all DVD/CD-ROMs and reboot. Windows
will say "New Hardware Found" and install.
BIOS by pressing F key (correct F key is noted during boot) and make sure
BIOS see's the Optical Drive.
Does the display show anything before you enter windows? If yes, then press the key to transfer video back to your original screen once you enter windows. It should be the function key "Fn" + F5 - F8. looks for the icon which shows a monitor or says "CRT/LCD".
If it doesn't show anything before you enter windows I'm afraid your screen needs to be replaced. Good luck.
May be a bad power jack or the powercord/ac adapter may not be putting out enough power.Your powerboard may need to be replaced or even the button itself may not be getting contact to the board itself.
You should have a Fn button on your laptop, and pressing that, combined with the button that has a sun on it should raise your screen brightness, if your screen only has one brightness setting, and it got much darker all of a sudden, your LCD lamp probably went out, in which case it is probably better to buy a new laptop, because those are expensive to replace.