MacBook late 2008 unibody beeps but still works fine.

Hello,

I have a late 2008 macbook aluminum unibody that beeps 9 times every time i try to start it. 3 short 3 long and 3 short beeps every time. It goes through this cycle 2 or 3 times, until it gives up and boots. Once i log in, everything seems to work fine. The computer is not slow, and it stays cool. I already replaced the ram, and it still beeps. I've been reading for about 4 days now, and i can't find anyone with the same problem. Most of the people get three slow beeps, and it usually is the ram. The people i have found that get the same 9 beeps, are not able to boot into the OS. So i finally gave up and came here to try and get this thing working right. I don't think is anything mayor, because like i said before, once it boots, everything works just fine, as a matter of fact i'm typing this on it.