Beeping on my IMac

What Mac, with what version of OS X?

Beeps on startup:

1 beep = no RAM installed

2 beeps = incompatible RAM types

3 beeps = no good banks

4 beeps = no good boot images.

5 beeps = processor is not usable

http://support.apple.com/kb/HT2538

Mine started beeping 2 days ago, its the top imac 3.4 i7 with full Ram.

Doesnt beep on startup but during use, random.

Pi$$ing me off 😟