alot of older hp's have nvidia graphics (DV2000 - DV6000 - DV9000)
if its one of those theres a 90% chance it has an nvidia gpu/chipset (AMD models)
if so, 99% chance the motherboard is dead because of the gpu.
The laptop is intel i3 cpu based. First gen core i3 and intel chip. Windows runs fine. Its dont look like dead mobo. I will try reseat ram first.
I count continuous 35 beeps. Checked laptops built in diagnostic. No problem found. How do i sure if it is faulty mobo?