My son playing hes zoostorm gaming pc running windows 8.1 when they had a power cut in the house. pc powered back up afterwards but the keyboard and mouse no longer function although k/board lights come on briefly and the mouse light stays on im stuck at the welcome screen. entered bios and both work there and i know how to change boot settings but do not have a restore disc. so i cant enter safemode or go to advanced settings. is there something i am missing or do i bite the bullet and purchase a new windows disc. any help would be appreciated thanks.