Have a new dryer hooked up in box,turned power back on and nothing. Seems there is no power in the box. Tester shows no power. What can be the problem?

Did you have to rewire the device box to accommodate a four wire connection?

Have you checked the breaker to make sure it has not tripped?

Do you have a multi-meter?

Is this a 240 VAC dryer or a 120 VAC driver?

It is a 240 dryer, 4 wire
Breaker is not tripped
No rewire because was told to connect neutral and ground to same bus.( was skeptical about this but tried it)
No multi tester :( just pen tester

Think I may have to break down and call a pro. What can u suggest

Here are some pics

Call a pro in. I see typical DIY workmanship.

Connector is missing on the new cable entering the panel.

The 2 pole breaker needs to be installed in the center of the panel.

I have no idea why there is no power in thre FPE panel, need to check feeder to this panel.