When I try booting from disk I receive 3 beeps

SL boots fine.  When I try to boot from cd to run disk utility, I receive 3 POST beeps...  I have upgraded to 8gb ram

I know this is an old post, but after a number of visits to the GENIUS BAR, and purchasing new RAM to see if it was actually a RAM issue the fix turned out to be quite unintuative soI thought I would post my fix.
Here's what I ended up doing:
Temporarily downgrade to 4 Gig Ram.  I know, your MBP probably supports 8 Gb, but for whatever reason the boot from my CD didn't like this when I was trying to upgrade to a newer version and complete a disk utility fix.
So when I downgraded to the 4G sticks everything worked.
Just another thing to try, if reseating your 4G X 2 sticks doesn't appear to be working.

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