I was working on a friend's Presario 2500 and I think I killed it. It had numerous problems - would not boot with a battery in it, the mouse touchpad did not work, and it seemed as if the A drive could read but not write. I used a usb mouse, reformated the hard drive, reloaded windows xp home, installed some software, and bought a new battery. It had trouble with the new battery - would charge it and then drain it completely very quickly. But it worked - if you kept the battery out and stayed far away from the power cord. Then I tried updating some drivers from Compaq as well as BIOS (the latest version corrected problems with batteries so ...). I downloaded the new BIOS on another computer and loaded it onto a floppy and then put it in the laptop and rebooted. Now it turns on and shows the black screen with Compaq in red but stops there. The fans run but no beeping, no hard drive light flashing etc. Is it now totally dead? Is there anything else left to try? I know enough to be dangerous but am not real proficient.
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Try booting into bios and check the rompaq update and date. Compare them to what you have downloaded. I think your new battery is an old stock and not able to receive enough power to charge.
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If the cmos battery is accessible, try to reset it. I think it's the last remedy to be considered. Bios updating is very delicate, once you loaded a wrong bios/rompaq update into it you will have a totally dead pc (corrupted bios). Replacing ROM/BIOS chip is 50-50 chance, what you …
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