How many times is a Dell Inspiron 1525 laptop supposed to beep on start up?

Assuming that everything is functioning normally. My new Dell Inspiron 1525 (a replacement for one that had a faulty motherboard) beeps twice upon start-up, or when awaking from hibernate or sleep. I have had no problems with the system to date, but I'm just wondering if this is normal. Thanks in advance to anyone who answers :)|||Just one short beep.