HP Compaq — System Ram is giving trouble

My notebook Compaq Presario V3000 purchased 1year completed, but now the problem is that it dose not work after remain open 20-30mins, it becomes hot & Hanged up the system. So what to do plz suggest.

some problem are occuring in my pc.During run the cd /dvd in DVD writer and pc hangs and create loud sound from speakers and DVD drive.And moniter used to fluchuated and mouse and keyboard don't work properly after this PRODUCT IS UNDER WARRENTY,
PC DESCRIPITION
Compaq SG3153IL
PROD# GS176AA#ACJ
S/N INA7340GMG

PH.[protected],[protected], 2587124
PIN CODE:243003
ADD:HN167, CHAUDHARY TALAB, BAREILLY(U.P)
REQUEST:PLEASE SEND AN ENGINEER TO TACKLE THIS PROBLEM BECAUSE THERE IS NO SERVICE CENTRE IN MY CITY

i hv lost my warrenty card. so how can i get the duplicate of that...

I have a compaq SG3153IL pc, S/N-INA73706CV, PROD# GS176AA#ACJ .
The dvd writer has stopped reading dvds however is working well with cds... The system responds slowly whenever a dvd is inserted..
that dvd works fine in my friend's pc.
So what could be the problem? and what is d solution??