Cathode lamps use a 'driver circuit' to change the 5/12v DC to a high voltage. Unplugging while on might have disconnected one of the power leads before the other and sent a 'kickback' down the other lead and fried some stuff. Or a small static discharge could do the same.
Shut everything down, make-sure the PC is plugged in BUT NOT WITH THE PHYSICAL POWER SWITCH ON [at the back, or on the wall] - this means the case is still grounded. Touch bare case metal first to discharge static before touching any parts of the system, and don't walk around and touch stuff without doing this again. Wear cotton if at all possible and keep sleeves etc away.
Check all plugs and connections in the system, and see if you inadvertently pull another plug out.
Retest and report.