Open the case and look on the motherboard to see if any capacitors are bulging or even leaking electrolyte. There was a generation of HP motherboards that were plagued with this problem (Bad Caps) and no boot is a common symptom. See this site for more information:
http://www.badcaps.net/
If you see any caps that are bulging or leaking, probably the motherboard has gone bad. If so you will have to contact HP for replacement as the OEM version of Windows may not boot on a new motherboard as it recognizes a new machine. The recovery program probably will not run either.
J.
Last edited by jseidel; February 18th, 2007 at 10:01 PM.
Cooler Master Elite 430
Asus P8Z68-V PRO/GEN3
Intel Core i5 2500K, 3.30 GHz
ADATA 8 GB DDR3
EVGA GTX 560 1GB PCIe
Sound Blaster Recon3D PCIe
1 TB Seagate Barracuda 7200 RPM
P/S: Corsair GS800
Windows 10 Pro 64 Bit
. . . by Digital Storm