Could be a problem with the power supply.  On an old computer, it took a
while for the power supply to warm up.  The workaround was to pause at
the bootloader menu, leave the computer for a while, then reset it.  (It
would usually freeze withing a minute after being turned on, so letting
it do that at the bootloader rather than while loading the operating
system saved on having to fsck.)  The solution was to buy a new power
supply.
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