I just did this too. replaced CMOS battery its still the same. My beep is like continous not like 5-6 times it comes and stops.Check this one out. If 4 beeps then ram issues.
My laptop is also making beep sounds. 5 beeps then break then again 5 beeps. Internet research suggests its the cmos battery running out which is believable since the laptop is 5 years old. Ill be replacing it this saturday/sunday (cmos cell is just 30-60rs). If you also have 5 beeps then reply to this and i will give u an update on my issue after changing cmos cell.
Good advice. Use an eraser to clean the RAM contact points. Check YouTube if you're unsure.You can try reseating the ram and making sure the contact pads and the slot itself is clean of any dirt/lint.