Knowledgebase: Macintosh Tips
lamp iMac beeps at startup
Posted by (Inactive) Lacinda Riesland, Last modified by (Inactive) Lacinda Riesland on 29 November 2011 02:27 PM
As explained by Sad Macs, Bombs, and Other Disasters (an invaluable resource; 4th Edition, page 138 for those who have it) the number of beeps indicates a problem encountered by the Mac's Power On Self-Test (POST):
1 beep = No RAM installed/detected
2 beeps = Incompatible RAM type installed
3 beeps = No RAM banks passed memory testing
4 beeps = No good boot images in the boot ROM
5 beeps = Bad ROM boot block or processor is not usable

from http://forums.appleinsider.com/archive/index.php/t-28731.html
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