Problem with dv 6000

Hello,

I have been having issues with my dv6000 (dv 6519tx) laptop wherein everytime i start my laptop it gives four beeps, out of which first one is long and the rest are shorter, with certain gap between the first and the rest.

I tried to remove memory from slot and replaced back in procedure but it still didnt work.

Before getting into this status i had other issues with display aswell. I used to get some error everytime i start my laptop with blue screen saying n_vi and some numbers (not 100% sure) and sometimes even it used to startup with 6 screens in one. Finally when it reaches to desktop screen it used to be one screen as usual , i wasnt sure during that time and now iam paying back with pain....please help

windows xp