Want a program to test my motherboard and cpu

[Dilzem]

I want something that can test my motherboard and cpu ive heard of prime 95 but dont know how to use it dont wanna do any damage

 

[Dilzem]

changed my mobo and cpu about 2 weeks ago this mobo has been giving me problems first it was overheating when it was idle then noticed the southbridge was on fire when idle and heard the northbridge heatsink werent to good so i replaced the northbridge heat sink with a zalman zm-nb47j and stuck a heatsink on the southbridge cos it did'nt have one did a bios update temps aint to bad now then found out the mobo was overvolting the cpu its supposed to b getting 1.35-1.40 mobo was giving it 1.47 so im using crystalcpuid to lower the voltage mobo i have is a asus a8n-vm-csm cpu is amd64 3000+ i would like to test the cpu and chipset could u show me how to use prime95 please