XPS 8900, power button failure, SupportAssist

Shut computer down would not start. Notice starts were becoming harder over time with button. 

PSU tested fine

When I remove the power button cable from fpanel1 on motherboard and connect power it will start.

Problem is without cable attached to the motherboard Dell SupportAssist will not allow Windows to start. Get error screen saying check power button cable.

How can I bypass this screen until power button arrives for replacement?