Laserjet 4P nothing after vacation

[kentak]

My Laserjet 4P will not power up.
There are no lights, nothing. I checked the voltage on the plug going into the printer, and its okay 120v.
I turned it off for a month for vacation, but now it won't power up.
Are there any ideas about a fix?
Ken tak

[MichaelTech]

Ken, the power supply is the main board on the bottom of the unit.
The A\C input assy. plugs into it from the side. About five screws, and re-install it. Lots of taking apart to work on! Let us know if your up to the task.