By chance I have the same Pentium II too (400 Mhz), so here's how:
It doesn't open at the front. Instead (there are no screws to remove at the back), push the entire metal cover forward and lift up, in direction of front, not back like on other desktop computers. Putting the case up so it stands on the back, and pulling the cover might help there.
It's quite simple once you've figured out how.
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