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A magnetic tipped screwdriver won't harm a modern PC. You'd have to get the thing pretty close to the platters of the drive to do anything to it.
You say "star point" which is confusing. The closest to a star I can think of are Torx bits, which are pretty much better in every way compared to the standard Phillips-head screwdriver (plus shaped slot.) Assuming you have the proper screws to use with them, they should be fine.
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