Compaq Presario F700 booting problem

Thank you for the clarification - I'm sorry I misunderstood you before. If the laptop shuts off immediately, before anything has a chance to appear on the screen (no logo, no words, no blinking cursor, nothing), then the problem is being caused by the hardware involved in powering on, not the software involved in "booting up."

I assume you're having this problem regardless of whether the computer is running on battery or AC power (if that's not the case, then you probably don't need me to tell you that the problem is either in the battery or the AC adapter).

Since the problem is not where the power comes from, it's an issue of where the power goes - that's either the motherboard or a cable that carries power to it. One or the other is not working properly. If your computer is still under warranty, then I recommend exercising that warranty. If you don't have a warranty, You may have no choice but to pay for a technician to open it up and replace which ever part is not working.

I wish I could give you better news, but if you can't get the power to stay on, then all the boot-up tricks in the world won't help. And if this were a desktop PC, we could take out memory sticks, PCI cards, and other components in an effort to isolate the problem. But laptops are self-contained, and they're not easy to pop open and play with. Motherboards can sometimes be defective - I've had two defective ones myself, and that's what may very well be the case here. I hope it's just a cable or a small component, but there's no way to be sure.

Sincerely,
H2H

SOLVED: If Compaq laptop F700 series ( have F700US) does not boot right and black screen comes on and keeps on rebooting before you get a chance to see anything on the screen REMOVE HARD DRIVE, REINSTALL HARD DRIVE, computer boots now fine.
It has happened to me 2 times so far.