Rovers were two up inside 15 minutes thanks to goals from Sam Gallagher and John Buckley before Alan Browne pulled one back for PNE.
Blackburn extended their lead before half time and rounded off the scoring just seven minutes into the second half with Lewis Travis netting the fourth.
13. Sean Maguire - 5
A half time sub for Cunningham having looked bright in recent weeks, had very fleeting moments where he looked productive but they would be short lived before being snuffed out. Photo: CameraSport - Ian Cook
14. Joe Rafferty - 5
Came on with 20 minutes to go as Blackburn were giving PNE the runaround. Ball was passed around him as the visitors were in full flow. Photo: CameraSport - Dave Howarth
15. Ali McCann - 6
Only got 10 minutes at the end to prevent Ben Whiteman seeing red, as most were throughout he was left chasing shadows as Rovers romped home. Photo: CameraSport - Rich Linley