What do you mean booting in MS-DOS mode doesn't work? Please clarify. Do you mean that you can't get into MS-DOS mode, or JJ1 won't run in MS-DOS mode, or that you get the exact same problem in MS-DOS mode?
If you get the same problem in MS-DOS mode, then there may be a hardware or display incompatibility. What are your exact system specs? (Video card, processor speed, monitor, memory, processor type [AMD or Intel], etc.) I can't really ask your dad, so you need to ask him and relay the information to here.
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With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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