plz help me.my cd drive is not appearing in "my computer" and whenever i insert any cd,it does not read it.I opened my device manager and there my cd drive was appearing but near it was a yellow ! sign.plz tell me wat to do

If you are seeing the Yellow ! in Device Manager, that means that your computer is recognizing the drive, but doesn't know what to do with it.

You'll need to try to reinstall the drivers that are associated with the drive. They can be found with any CD's you got with the computer, or go to the manufacturers website and find them there.

If you list your computer's information here, I'll help you find anything you need.
(i.e. Computer Brand, Model Number, Year Purchased, any other info regarding to your specific computer)

One of these may help:
1. Uninstall the drive through Device Manager.
Restart computer. The drive will be automatically reinstalled.
or...
2. http://support.microsoft.com/kb/314060
Restart computer.
or...
3. Download, and run Restore Missing CD Drive patch
Double click on cdgone.zip to unzip it.
Right click on cdgone.reg, click Merge.
Accept registry merge.
Restart computer.
or...
4. Go to Device Manager, click a "+" sign next to IDE ATA/ATAPI Controllers.
You'll see two items:
- ATA Channel0 (or Primary Channel)
- ATA Channel1 (or Secondary Channel)
Right click on each of them, and click Uninstall. Confirm.
Restart Windows. They'll be automatically reinstalled.