Long loading process when at the apple screen on Macbook Pro, then turns blue and just stays there. What can I do?

I have tried entering safemode, but to no avail, it just gets stucks at the grey screen with the apple logo. I have tried putting in the CD for installation which needs to press a C when restarting the laptop and also holding the option button when restarting the com. Any other tips? Im not good with handling problems. Thanks.

Follow these documents.
http://support.apple.com/kb/TS2570
http://support.apple.com/kb/TS1440
http://support.apple.com/kb/HT1455
http://support.apple.com/kb/ht3964
http://support.apple.com/kb/HT1379
Try to get into your machine and if you do, the first thing you dois
backup your files to a external drive. (not TimeMachine) viaregular
drag and drop methods.
Disconnect this drive. and all others.
Repair Permissions /Drive from the installer disk
You can then c boot off the installer disk for your OS versionand
under the Utilities menu is Disk Utility > Repair Disk and
Repair Permissions.
Any warnings related to Disk Repair that are not repaired
is a sign of trouble.
This one about permissions you can ignore
http://support.apple.com/kb/TS1448
Reinstall OS X
Also you can reinstall just OS X itself while c booted off the
installer disk, shouldn't effect your programs or files
(but backup all files just in case)
Hold off Software updating until your third party software
has a update to work with the current OS X version.
OnyX clean and check
You can download and run ALL the cleaning and maintenance
aspects of the free OnyX and reboot here:
http://www.titanium.free.fr/
Also use OnyX Verify > Preferences (check to show onlycorrupt)
plist files, write them down and find them and move them to your
desktop and reboot, they will be rebuilt. If everything is finethen
delete the old plists and set your preferences again.
Most drastic method
If that don't work, c boot off the installer disk again, thistime
use Disk Utility to Erase >format HFS+ Journaled with Security
option > Zero All Data (will take some time) This will totally
wipe the drive of everything and is a last ditch effort.
When it's done quit, and reinstall OS X.
You'll have to go through the setup and reinstall your programs
and files from backup. Secret is use the same user name and
drive name as the previous time so your iTunes folder will work
without a hitch.
If you restore from TimeMachine, it's possible whatever problem
you had can return, but you can try and if it doesn't work, just
repeat above without TimeMachine.
Clone your boot drive
Later look at free/donationware Carbon Copy Clone your boot
drive to a external HFS+ Journaled formatted drive (in DiskUtility)
and keep in a safe place, it hold option bootable, reverseclone
great if your hard drive bites it, or TimeMachine gets hosed.
TM isn't bootable.

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