Monster MPA-3250 3 Channel Power Amplifier 250WPC 135425187675 and screen backlight comes on

and screen backlight comes on but screen is blank

HOYA 49MM UV(O)

Manufacturer Taizhoo Zuoxin Model Number 4IK25GN-SF-4Y SKU 19-78741 Ref 23-113383

Manufacturer Benchmark Model Number RotoBot SKU 19-71934 Ref 23-102728

Manufacturer Festo Model Number VUVG-L14-M52-AT-G18-1P3 SKU 19-72504 Ref 23-103603

Monster MPA-3250 3 Channel Power Amplifier 250WPC 135425187675 and screen backlight comes onCondition Used Description This item is fully tested and in excellent working order. Item will come with a 30 Day Warranty. Cosmetically in good condition showing minor scuffs scratches blemishes from previous use. Includes 3 Channel Power Amplifier as pictured. No additional items or accessories are included. Unless pictured, no power adapter power cable included. Photos are of the actual unit for sale. Inventory is on hand and ready to ship. Please