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DVD codecs are missing. You can download a codec pack for free and install. This should solve your prob. Older DVD rom drives did not come with onboard codecs. When you format and reinstall the registered codec can get cleaned away. Like baby out with the bathwater...............
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.
Try disconnecting the plug form the motherboard. If the LED stays lit, you may have a problem with something you touched inside. But, if the LED does not come on at all with nothing connected, the power supply is dead. 300W should be enough to run your computer, unless you have multiple graphics processors or too many peripherals, but just upgrading memory shouldn't make a difference. Make sure the memory is seated correctly, maybe try taking them out and putting back in, or check to see if maybe you loosened something inside while you were in there.
first you have to have the correct driver with correct verion or model no right click my computer then properiws then hardware then device manager then expan audiovedio controller if the reis an yellow question mark the driver is not installed properly you might have recive the motherboard software with your system and insert in the system and install them