Stuck on blank blue screen when booting- HELP!

When I boot up up I get the normal grey screening with spinning pin wheel, but then it goes to a blank blue screen and just hangs there. Tried resetting the PRAM but didn't work, also want to boot from the install cd but I can't the cd drive door to open from the keyboard button.
Help please!

Hold the mouse down during startup to get the drive to open.
Or use the OPTION key to stop at boot selector and do it then.
I would make sure to have a working bootable backup of your drive at all times, and an emergency boot drive/partition.
What might help:
Boot from another drive. Turn off journaling. Repair drive.
Once at Finder desktop, delete the caches folders on your main drive.
/Library/Caches
/System/Library/Caches
/System/Library/Extensions.mkext
If the repair was "successful" and DU is not 100% certain to see and fix all possible errors, for that Disk Warrior or TTPro would be needed.
At the least, repair from current DVD of OS X, or SAFE BOOT, or Single User Mode and run FSCK.
Then do Safe Boot from your main drive.
But do install OS X to another drive to work from.
PRAM only affects settings. If you mean PRAM/NVRAM from cold boot, that would help with corrupt nvram due to hardware changes.
If you have or suspect a corrupt boot drive I would invest in Disk Warrior and/or TechTool Pro/Deluxe to use along with Apple Disk Utility.

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