hardware:
cpu ibm 686mx 233mhz
mobo: pc-chips mainboard MB-586VXU8
no sound card
atirageII vga good
samsung 1.6gb good
sensor controller card good

the pc itself does not boot, mobo is burnt.but thats not the problem

this pc is from a wheel alignment machine. from modolfo ferro, italian i think
it runs msdos

i tested the harddrive in 4 diferent older pc's(p2 350 and upwards),with several vga's(4)

the DISC boots well, the msdos as well, and the splash screen os the wheel aligment program too.
the problem is when i enter the options, the text and graphic's get disorganized, like text above text. i suppose, 5 options with five buttons in the screen, the text in the buttons only appears when i select the options. but it gets always messy to UNDERSTAND the program and the options.

i've tried several bios options with no effect

one curious thing is that with these different machine that i tested this hdisk is that the pattern of the "text over text" is alway equal, never changes.

and so, i think the problem might be in a simple configuration of the msdos files, like
autoexec or config.

the autoexec is this:
C:\DOS\SMARTDRV.EXE /X
@ECHO OFF
PROMPT $p$g
PATH C:\DOS
PATH=%PATH%;C:\TRTEST
SET TEMP=C:\DOS
MODE CON CODEPAGE PREPARE=((850) C:\DOS\EGA.CPI)
MODE CON CODEPAGE SELECT=850
KEYB PO,,C:\DOS\KEYBOARD.SYS
SET DOS4G=QUIET
CD \TRIGONAL
ALX9F
CD \

REM ========== By ASUS CD-ROM driver ===========

REM ====== Remarked by ASUS CD-ROM driver ======
REM C:\DOS\MSCDEX.EXE /D:MSCD000 /V
REM ============================================

REM ========== By ASUS CD-ROM driver ===========
C:\DOS\MSCDEX.EXE /D:MSCD000 /V
REM ============================================



the config is this:
DEVICE=C:\DOS\SETVER.EXE
DEVICE=C:\DOS\HIMEM.SYS
DOS=HIGH
COUNTRY=351,,C:\DOS\COUNTRY.SYS
DEVICE=C:\DOS\DISPLAY.SYS CON=(EGA,,1)
FILES=30
FILES=50
BUFFERS=30

[COMMON]

REM ========== By ASUS CD-ROM driver ===========

REM ====== Remarked by ASUS CD-ROM driver ======
REM DEVICE=C:\ASUS_CD\ASUSCD.SYS /D:MSCD000
REM LASTDRIVE=Z
REM ============================================

REM ========== By ASUS CD-ROM driver ===========
DEVICE=C:\ASUS_CD\ASUSCD.SYS /D:MSCD000
LASTDRIVE=Z
REM ============================================

i would aprecciate that anybody could help me, YOU CAN SEE THE PRINTSCREENS IN THIS WEBPAGE

http://www.apmmotores.pt/1.jpg

any doubt's mail me at mnemonik at gmail dot com
I think it's unlikely to be the CASE that the autoexec.bat or config.sys files are causing this problem, but to be sure, are you able to put a fresh installation of DOS on this hard drive? i.e. overwriting KEYBOARD.SYS, DISPLAY.SYS, etc?

It seems to me more LIKELY that the wheel alignment program has become corrupted in some way. Have you tried copying the software across to a different hard drive?i dont have disks to install it either, i would no prefer to put a fresh install on it tha damned machine is already sold and the company where i work as already received the money LOL but the machine is still here.so i have a *censored* case in my hand, as my boss say, you have to do a miracle.
maybe someone could send me some clean KEYBOARD.SYS, DISPLAY.SYS, or someother you might find useful.FreeDOS