Q: All the the apps from the bottom of the screen doesn't have safrai,iMovie,mail,iChat,address book ,itunes,iPhoto,iCal,QuickTime player,system preference so what can I do ?do I need a disk reinstall the computer ?i bought this on eBay .

Open the hard drive icon on the desktop, open the applications folder and drag and drop any applications you would like to the dock

If your user account is an Admin account, there may be an issue;

however if you see the missing items still in their expected location

(not their Dock links, but the real items in Applications folder) then

you may want to see if your account is correctly set up.

You could make a second user account as a test. By default, most

items would appear on the Dock if you had an original install version

OSX that came with the computer. Much less if you only used the

retail DVD, as that does not include iLife, iWork, etc.

Was the OS X installed when you got the computer? You may have

to see what kinds of installation discs and content is available to you

that could work in that computer and consider a complete reinstall.

If you did not get the install-restore DVDs for the OS X system or

the original system discs for the computer (OEM parts) you could

contact Apple Support or ApplecCare by phone, with Serial Number

of your computer handy, and ask if you can get a Replacement

Install disc for OS X 10.5 (or 10.4) so you can re-install completely.

This topic has been covered a few times, in ASC discussions. If

you need system discs, they should match the build year model

and if restore discs are not available, the replacement disc may be.

These will cost a modest fee from Apple. Much more if you look

into the retail or ebay/amazon resellers. Other sourced discs may

not match the hardware you have. Be wary of gray lable installers.

Also, there may be low-level or sector damage on the hard disk drive

if the system acts messed up, so a thorough erase/install process

could be used; as part of a troubleshooting effort. The hard drive may

be going bad, if the system starts missing parts, acts up, crashes.

Wear items such as hard drive, optical drive, and other parts can

start to show up when issues present themselves in an older Mac

or any brand of hardware. Troubleshooting helps tell if the problem

is based in software or hardware. Techniques vary to find this out.

Hopefully this helps...

Good luck & happy computing!