Please help: Mac won't start, can't run on CD

[LilMissSunshine]

So I already put a CD in when my Mac froze and I restarted it.

I tried to turn it on and I just get a blank screen while it makes a very loud noise.

Turned it off then on, then a blinking folder with question mark.

All advice says to run off the CD but I can't put a CD in since my CD won't eject.

I also pressed shift, nothing.

My hard drive crashed earlier this year and they replaced it, what do I do??

Ok, so I took my CD out by pressing down the trackpad button, installed disk cd, but nothing. Just a blank screen and a lot of noise.

 

[eawmp1]

Did you hold down "C" on reboot? If so and you stiil have the problem...?RAM/board problem

 

[LilMissSunshine]

I finally got it.

It says: Mac OS X cannot be installed on this computer.
Ok Restart

Do I choose restart or ok? :|

Okay sorry, I've gotten to utlility disk.

Online it says to go to first aid and verify/repair disk. However these options are not available for me to click...?

http://kb.wisc.edu/helpdesk/page.php?id=3810

Everything I've gone to is the same as here ^ only the button to repair disk isn't highlighted..