Three beeps after closing and opening lid.

Question

Hi everybody.
I have a MBP 13", late 2011. I installed 8 GB and 2 months later, I started to listen to 3 beeps and those happens when I close the lid and leave some hours closed and then I open it. I read in some foruns that it might be a software problem and not a dying HD.
I performed a memory test with memtest software and both banks look fine.
I also read that I should disable the option that turns off the HD.
When I open the lid I have to push Turn On buttom and it beeps. Then I push 5 sec to shut down the computer and when I turn it on, I see one bar being filled, meaning the computer hibernated.
After all of it, it still beeps. I think, but I'm not sure, that it only happens when I lock the computer and close the lid. I didn't try to leave with open session for hours.
I also run sudo pmset -a hibernatemode 0 then 3, then 7 and last 25 and the beeps come over again. Now it is hibernatemode 3.
Is there any fix for that? Ah, I started in safety mode, with no good results.
Thanks
Sérgio

Answer 1

I'd like to add that this situation happens when I lock my account and close the lid. If I don't lock it, this problem does not happen.
Here is my configuration:
pmset -g custom
Battery Power:
lidwake              1
standbydelay         3600
standby              1
ttyskeepawake        1
hibernatemode        3
hibernatefile        /var/vm/sleepimage
displaysleep         2
sleep                10
acwake               0
halfdim              1
sms                  1
lessbright           1
disksleep            10
AC Power:
lidwake              1
standbydelay         3600
standby              0
ttyskeepawake        1
hibernatemode        3
hibernatefile        /var/vm/sleepimage
womp                 1
displaysleep         10
networkoversleep     1
sleep                10
acwake               0
halfdim              1
sms                  1
disksleep            10
Thanks!