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if you cant remember the bios password simply make sure its plugged out remove the laptop battery locate the cmos battery and remove this for about a minute or two, then replace everything, this will make the bios reset and hopfully the password will be removed
hope this helps
Either the power supply is putting out too low voltage or the power jack is bad.Try moving the ac adapter tip around while its starting up to see if it keeps it running or shuts it off.If it makes no difference try another ac adapter that does work for sure and see if thats the problem.If neither approach works,then the HDD may be seizing or one of the ram sticks may be bad.Some sort of hardware conflict can cause shut downs.You would have to take the bootstrap approach to narrow it down to one pacific component.
r u mention for battery light?if is it true,then the light is blinking because of your laptop want to make sure the power supply charge that battery.if it is in charging condition,the light on.but if the light goes off,that mean, the battery is already full.
But when u use adaptor without battery, the light will goes off because no charging session is in progress which has same behaviour with battery full(during battery full,no charging session occur)
Sounds like the auto-dim in the BIOS is set too low. Fortunately the Compaq R3000 allows you to adjust the brightness right from the keyboard. Hold down the [FN] function key while tapping the [F8] key will brighten the screen, while [FN]-[F7] will dim it. The settings are different for running on AC power and battery, so you must do each individually.
It appears without looking at the laptop you have removed or dislogged the cable that goes between the motherboard and the screen. This is not hard to do they are very delicate. The only thing you can do is take it to a qualified service tech. i get these periodically in my shop too. Check the cable before you do so to see if you can reconnect it but be very carefull.
Be mucho blessed,