Took my pz4 apart now won't work

[Spartan tracks]

Now after putting it back together the headlights flash but nothing else works any ideas,checked all connections and crystal any help would be great

[jarndice]

Please forgive me for pointing to the blindingly obvious,
Have you got a fully charged battery in the Tank? and are you starting it up in the correct sequence?
TRANSMITTER ON FIRST then TANK ON.
I am sorry for asking such questions but you wouldn't be the first to get it the wrong way round That by the way includes me
shaun.

[RobW]

And then press the "start" button on the transmitter. No one ever makes that mistake.....

[jarndice]

Oh thanks Rob, You have no idea how reassuring it is to know I am not the only one.
shaun

[Spartan tracks]

Found out what it was' A faulty board swapped for another and now fine,they are all going to be junked for IBU2 over time but thanks guys