Windows on my laptop crashes to black screen frequently, more than once a day it seems. I am running Windows 8.1 I get "Realtek PCIe GBE Family Controller series V2.55; PXE - E61: Media Test Failure, Check Cable PXE - M0 Exiting PXE ROM then a request to "Reboot and Select Proper Boot Device or Insert Boot Media in Selected Boot Device and Press a Key ... wish a were a geek. somebody help. and i don't do network if i understand it; and do not game either