Asus z83d Laptop: Keyboard & Touchpad Freeze, Windows XP Service Pack 3, External Devices Work

Hello colleagues - computer experts.
Well, I have such a problem with the laptop as in the title.

I sold a colleague to the above laptop was functional. has uploaded Windows XP with Pack 3 service.

Everything was OK. After a few days he called brought Asus and the touchpad and keyboard did not work. it happens so::

after switching on the touchpad - the mouse works, you can open folders normally, activate functions until you press any button on the keyboard, then everything locks, the keyboard and touchpad do not work. I mention that after turning on only the touchpad works, the keyboard does not work when Windows starts.

By connecting an external mouse and keyboard these work properly.
I searched the messages on various forums, but those mainly concern Windows 8. I have redone the steps of the tips and nothing helped, I restored the system, I went to LOCAL MACHINE and everything is OK. I also pulled out the battery because it does not hold anything and the same on the power supply itself. Or is it the motherboard, some bridge is failing.

I am asking for advice because it is nice, big old equipment. Thanks in advance for the hints

Can you enter the BIOS or Boot Menu using a laptop or USB keyboard?
Do numlock and capslock diodes work - those on the laptop case?

Hello. In the evening I will check, although the keyboard does not work from the beginning, I will not enter the bios using the laptop keyboard, I did not try using the USB keyboard, I did not pay attention to the controls, but if it does not work at all, it probably does not switch the function, in the evening I will check and write. Regards.

Added after 13 [hours] 39 [minutes]:

Hello. I'm sorry this is late but such a job.

The external USB keyboard only works after the system loads, so there is no way to enter the bios.

as I described above - after launching the tuochpad system and its buttons work properly until you press any keyboard button and then everything is locked. You cannot turn on the capslock with a laptop keyboard, because when pressed it immediately locks.
So there is no option to enter the bios. I don't know if re-installing the system will fix the case, but I think not.

So you have the same problem as the Asus X70IO which is in my repair. I replaced the keyboard without any changes (without the keyboard too), no visible damage such as flooding / burning / corrosion of elements, I suspect damage to the KBC system (keyboard controller layout, touchpad and a few other things) or its adjacency. I don't fix it myself, but maybe I will send it to an external service, then I will write something more.

Maybe the system just needs to heat up a little.

An external service wrote "damage to the hybrid bridge" and returned the laptop due to the lack of availability of parts.

Hello. I solved the problem. I connected an external keyboard and it works great.