I have a hp pavillion a1440n and my motherboard is a "Limestone". I need a new bios or is there any way to flash the bios besides the normal standard way

not enough info.
F10 normally saves settings and reboots. Do you get to and do that?
Explain when it "disappears"

If that computer wont boot to a screen that you can recognize, it is a brick. When the bios is corrupted and it wont allow the machine to start you cannot access any screens that will allow you to recover. It takes special equipment to flash the BIOS when this happens and most places just replace the whole motherboard because this equipment is not used often by repair shops.

F27 seems to be the latest BIOS for your device.

You may be able to rescue it with a Bios flash, but it sounds like your motherboard died.

Most laptops vary teh speed of the porcessor as needed, as a power saving measure. Less speed uses less power.

When the laptop is idle it drops the speed and increases as more is needed.

You say you get a bios, does the bios detect your hard drive?

you need to go to HP web site , and down load the lates bios to update system

hmmm..those are truly hard to find, the clips...

also, the bios password can be accessed on startup by using F2, then you'll see that option inside the bios setup.

those batteries are usually inside, under the bottom plastic panel. some others are under the palm rest, either way, you need to open up the whole unit.

the button normally used is DEL or F1 press the button when the computer starts