IMac Black Screen, making some progress with the CAPS LOCK key...What???!!!

Ok, super weird situation here. My friend brought me his iMac because when he turns it on, it makes the chime sound, the front light goes on, but the screen stays black.
The first thing I tried (as a former pc user) whas to start pressing the CAPS LOCK ON and OFF to see if the computer froze at some point, but to my surprise, after hitting the CAPS LOCK many times the screen appeared.
Ok, but the white screen with the gray apple was all distorted, the apple with be filled with little rainbow boxes and lines on the whole screen, so I thought, the Video converter might be bad.
But then, when I tried for the third of fourth time, it appeared the same white scren with the gray apple and the progress circle spinning again, but this time it looked perfect, BUT it froze, and it just stayed there.
Thats what I have so far......any ideas? I tried the Controlcommand+PR but it didnt do anything......
Thanks

It appears that the Mac is passing the Power On Start Test which results in the chime advising that the RAM seems OK. But there is something wrong with the boot volume. Try booting from the Install DVD that came with the Mac. In the Utilities menu of the Installer use Disk Utility to Repair Disk. In the left hand list choose the boot volume. On the right hand, in the First Aid pane press the Repair Disk button. Repeat until no repairs are reported.
Dah•veed

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