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plug it in see what happens. maybe a popped circuit breaker. Typically I do a whole startup process that consist of..
pull Horz Out tube(s)
Pull Vert out tube
DC volt meter on B+
AC volt and AC current on variac
check B+ overall resistance (before doing any power up) should be around 7-10k
it the B+ over all is ok, then crank up the variac and watch for the B+ to come up while keeping an eye on the AC current.
if all goes well I generally go to about 400vdc on the B+ slowly with the variac while feeling the filter caps. If they stay cool and the overall current seems reasonable (about 1 amp for the filaments, the rest of the set with sweep circuits disabled will not pull much), then I will put the output tubes back in and do a full power startup, this time with a HV prob on the CRT anode and a current meter in the horz out tube cathode circuit.
All of the above sounds like a lot, its not, but I just like to play it safe. You could just plug it in, see if anything lights up, if completely dead I would suspect the power switch or a circuit breaker. If the tube start to glow then you could just wait and see, keeping an eye open for smoke.
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