Satellite A105 Shift Keys stop working after BIOS update

I have a stack of laptop boards from the A105 series (Intel chipset) that I received with bad BIOS's. Two worked, and I updated the BIOS's on them to fix CPU compatibility issues. After that, the shift keys stopped working, and pressing Shift-A causes the power light to dim. Reverting to ANY previous version BIOS, whether through the Windows program, CD, or Crisis Recovery floppy (magic key is "F", not "B", "Esc", or "U"), does not fix the keyboard problem.
To make things more confusing, I did notice that the one single BIOS that seems to actually correct the problem is version 1.50, which I haven't seen available for any Tecra A7 or Satellite A100/A105, except a couple A100's, but the BIOS file is much too small and can't be loaded.
Does anyone have any idea why these Intel-based boards are doing this? Or does anyone know where I can get a usable version 1.50 BIOS?
For the sake of this post, please consider my skill level to be high. (In other words, I would be thankful for people trying to help with "Replace the keyboard", but I have about a dozen keyboards, all of which I have tried, and all of which work on other laptops. Additionally, if you have just a theoretical solution, I'm definitely open to hearing it. Also, if a Toshiba tech would like to reply, I would very much appreciate it!)

Hi, thank you for your help.
Some motherboards were not in chassis when I got them. Is there a place the PSAAxx model number would be written on the boards?
Four PSAA8U (Two A105-S4334 and Two A105-S4014) - Intel Chipset, fingerprint reader. Tried BIOS Versions 1.40, 1.70, 2.00, 5.10, 5.60, 5.90, and 6.00. Shift keys do not work on either one.
Two PSAA2U (A105-S2091 and A105-S2031) - ATi Chipset. BIOS versions 1.50, 1.80, and 2.30. Keyboard works.
Another PSAA8U (A105-S4184) - Intel Chipset, no fingerprint reader. BIOS version 6.00. Keyboard works.
I noticed that so far all of the models with fingerprint readers have the problem. All of the ATi Chipset boards are working fine, but they have significant processor limits. I am in the middle of updating the BIOS in another Intel one using a Crisis Rescue Disc, so after that finishes I will try disconnecting the fingerprint reader to see if it has an effect.
I don't think the keyboard controller is faulty, because these boards all failed on the same day. I have tried updating the BIOS using WinPhlash, Phlash16 in DOS, the install CD, and a Crisis Recovery Disk. I set the defaults in the BIOS almost every time, and I also have tried holding the power button for 60 seconds with the power cord unplugged and the battery removed (as some people have suggested.)
The shift keys don't work in DOS, Linux, Windows, or even in the BIOS. I test it in the BIOS by using Tab to cycle through the fields in time of day, then Shift-Tab to cycle backwards. This works with a USB keyboard, and it also works on the ATi chipset models and the Intel chipset models that are still working.
Thank you for your reply. (-:

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