If your VeeGo will not turn on, it is usually because the key is not in 'Position 3'. Your key lock on the side of the battery has 3 positions...
1) Unlocked & Off
2) Locked & Off
3) Locked & On
When your bicycle is new the lock may be a little stiff, jiggle the key between positions 1 and 2 before turning to position 3 if it is difficult to get to position 3 initially.
Once the key is in position 3, you should be able to turn your bicycle on by pressing the Power button on the LCD computer.