Is it the power light, or is it a low pressure light?
Are you getting a click when you press the start button?
Do you have a meter to check for power?
Do you have the cover off?
Can you check power to the solenoid?
It is at the point where water enters - usually a brown coil
No power to the unit?
Did you have your finger on the end of the screwdriver also?
If you check the Live Connection and also the Neutral connection and tell me if it lights?
Can you confirm it works by trying something you know is live?
Try a lamp with the bulb out?
It could be a duff screwdriver?
The coil is on top of Part No. 9, if you are getting no water this is the likely cause