what lenght, how many bulb's how long has it been hooked up ? do you have a extension on it ? heat sink ? where is it mounted ? http://www.icecapinc.com/document2.pdf
if you turn the power on, does it turn on for a second and then turn off? or nothing at all?
You can try swapping with bulbs you know that works. Otherwise check the connections to make sure nothing became loose.
With your ballast mounted under the tank, is it possible that it got wet somehow? Maybe the wire harness connection got wet (not necessarily the ballast).
Were they working all day with no flickering? check the connections at the bulbs. what type of sockets are you using? If you installed the wire into the socket then pulled it out the blades in the housing will not make solid contact once reinserted. Remove the socket housings and straighten the blades. It really could be alot of things. Just starting at the basics.
that means 1 bulb is bad, if you change the bulb it will turn on. always keep an extra bulb handy for that reason, Not trying to help. but you would probably say i sold you a bad lighting set, or maybe it was to hard for you to connect
if it is a ice cap send it back and have them check it, if it isnt over 3 yr's old and no water marks or foul play they will fix it for free otherwise it will cost about $70 with shipping i think thats what i just paid for mine to be re-done
the ballast is not more then 2 years old, it's inclosed in a box the frank built for me which ballast should still look brand new, send it back, i'm sure they will fix for free
the ballast is not more then 2 years old, it's inclosed in a box that frank built for me which ballast should still look brand new, send it back, i'm sure they will fix for free