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To "shadow" is to use a small amount of the RAM to hold a copy of the system-BIOS and the video-BIOS areas. This usually speeds-up the computer, i.e., use RAM that is faster than the RAM on the motherboard.
Was a good thing on old pcs. Not necessary on newer pcs to shadow bios or video. You may find increase in performance if you disable these in the BIOS settings.
The shadowing is an old technique. It means (if I remember correctly) that a copy of the BIOS and Video BIOS is stored on the RAM for quicker access. It should be nothing to worry about. The worst thing is that you dropped your laptop! I suspect that when you dropped it, you broke something internally. Without actually seeing the laptop, I cant tell you exactly what the problem is. I would try wiping the drive and reinstalling the OS. That should tell you if its the hard drive. (Although it is an unconventional way to find out). Also, depending on whats broken internally, it may or may not be salvageable, but it never hurts to try.
It is usually recomended that shadowing is disabled in the BIOs, so go to the setup Bios menu and select the default settings, press F10 and return. Re boot and that should be that.
-BIOS shadowing is a feature of the system's BIOS. You can only enable or disable it from the BIOS setup screen. -BIOS shadowing kinda like creates a copy of the BIOS to the system RAM for faster performance coz the RAM works faster than the BIOS ROM.
At the Boot-up or while the cursor is at the top right corner of the screen (when you start your PC), press the F1 or F10 key (It's different for different motherboards for some it's Del)..disable system and video BIOS shadowing in the option. Shadowing of BIOS just copies the BIOS code from ROM to RAM during bootup for faster accessing...
You might want to try calling Compaq Customer Care for more help.I hope it helped.
It should also indicate which key to press to get into system configuration (usually Del, F1, or F2). Go through the settings and find "Shadow System BIOS" or something similar and set it to disabled.
BIOS Shadowing copies the system bios from ROM to RAM when the system starts, and is un-necessary in modern computers.
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