Status of 2

[T.C. Zhao]

Recently, our SGI(4D/210GTX) is having some series problems:
it won't boot. When turns the powers on, I can see
disk  spins once or twice, then the status light by the
power switch flashes between 1 and 2 and nothings shows up
on the monitor while all this is happening. I am a novice
at this, and have no clue what's happening or how to deal
with it. Any help will be appreciated.