Boot loops every 1.5 seconds

Can't get any Shift F8 or ESC to work while powerup is going.
Once the desktop appears, the icons in task bar begin reloading, every 2 seconds.
Any attempt at a click is aborted by the reboot.

Only relief is press power button.
Tried removing battery and draining residual charge by holding power button 2 minutes. No difference.

Win8 laptop I purchased a year ago. Don't recall if disks came with it.
HP Envy dv4, 64 bit...

At least I learned that access to the troubleshooting menus is reached by tapping ESC or F2 immediately after poweron.
The recovery steps did not help. Hoping restore to factory original will work.

Are you familiar with bios settings? Try setting factory defaults in there first. Just to check, its allot easier than re installing if it works