Vista Continuous Reboot

My Presario F500 keeps rebooting upon start up with no light or anything coming from the screen. I have recently sent it to 2 professionals who worked on it but didn't fix it. I dont want to waste anymore money. I do realize that there is a recall on my battery. So i run the presario without the battery using the charger only. It still does not work so the professional told me it wasnt the battery. I did however research the issue. Post were suggesting many things could go wrong. Hardware issues,Power problems, Motherboard porblems and more. As for what the particular problem is im not sure. A lot of post suggest that I press f8 rapidly upon start up but that seems not to be working. It simply restarts at its intervals. What is most fustrating is there is nothing coming from the screen so it really makes me want to give up. If you have any solutions please bring them to my attention before I unfortunatley and reluctantly buy a new laptop. If i could get the presario f500 working long enough to follow some sort of instructions that we be much appreciated.

So you never see anything on the screen at all, it's completely black? How about beeps, do you get any beeps when it powers up? If so, how long after before it reboots?

Try resetting your BIOS.

It looks like 2 beeps is a BIOS corruption.
http://h10025.www1.hp.com/ewfrf/wc [...] ct=3316440

I would still try resetting the BIOS. Look for a reset button, possibly on the bottom.

Some laptops have a little pinhole for a reset button. Yours may or may not. If you see a little pinhole, stick a toothpick or pin or something in there for a few seconds to reset the BIOS.

It can be plugged in, but you want it powered off. Your laptop may not have a reset button. Some have a jumper hidden inside on the motherboard. I was hoping it would have a reset button. It's easier.

Following in the vein of Afords response, another Toms contributor, frozenlead, has written a tutorial on laptop disassembly, reassembly.

http://www.tomsguide.com/us/forum/ [...] pair-guide

Follow their instructions implicitly and it should see you right. Also if you have any questions in regards to your make of laptop they may be able to help, a link has been provided on the page for this.

When you disassemble the laptop be sure all power (including battery) is disconnected and take anti-static precautions.

You can also reset the BIOS / clear CMOS by removing the coin battery on the motherboard for a period of time. Some say 5 minutes is enough but with a laptop I would probably leave it out for an hour just to be on the safe side.

is the silver battery coin in this box like thing the best way to describe is it says hdd on the sticker and is covered by some type of gray and clear case and is blue underneath with a circler object in the middle it seems to be gray but may be black on the outline of the circle. Sorry about the confusion. I know im not very clear but my goal is just to get back to gaming.

That's the one. It looks like this.
http://ww2.justanswer.com/uploads/ [...] 9ulwd2.jpg

Ok, so resetting the BIOS didn't help.

If you tap F2, F11 or the delete key on startup, do you get anything? These are common function keys to get into the boot menu or BIOS.

The deadline:

If the notebook is eligible for the repair, they detail the deadline on the page, quoted below:

"You have up to 24 months after the start of your original standard limited warranty entitlement to get your notebook repaired if it is listed in the tables and displays one or more than one of the symptoms listed in the support article."