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The motherboard was replaced by an HP Technician due to a network connection not working. After he left and I turned on the system I get 'Invalid Chassis Serial Number'. The solution posted using the ESC button or F10 did not resolve the issue. The only thing that works is the 'F1: Boot ' message with a blue background that apprears in the lower left corner. Driver Printer Canon Lbp 810 Windows 10 64 Bit there. Download Software Wipro 1070 Dx Printer Driver For Xp on this page. Pressing F1 will start the Windows 7 Professional OS but can never get to the BIOS no matter what other button is pressed. The Invalid message occurs first each time the machine boots up.