Today my colleague told me that his 13" macbook pro (2009 ver.) cannot boot up with black screen. After taking a look, I found that it even gives out crazily annoying beep sound continuously (beep-beep-beep, halt, beep-beep-beep, halt, ......). I have not met that before and turned to Google for help. After some looking and trying (at some time I thought it is because a disc stuck in the drive), finally I found a few sources all point out that the 3-beep sound means "bad memory". The colleague then tried taking the two 1-GB RAM in and out to test and BINGO! The problem was caused by one single faulty RAM! So I will know what to do if any of my machine gives me that sound......
Update: One of my friends told me just now those beep sounds are called "beep code" and their meanings are dependent to different BIOS. A reference of Mac machines can be found here.
Update: Another reference in Wikipedia.
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