I have an acer computer that I did a disc defragment on and it got stopped halfway through from an automatic reboot. Now it won't do more than show the boot screen then goes to a black screen reading the following: Intel UNDI, PXE-2.0 (build 083) Copyright (C) 1997-2000 Intel Corporation For Atheros PCIE Ethernet Controller v126.96.36.199(11/02/10) Check cable connection! PXE-MOF: Exiting Intel PXE ROM. No bootable device -- insert boot disc and press any key I run windows 7 and have had the disc defragment stop halfway through before and it didn't do anything to it. I've also had it happen on other computers I've had. I have a lot on this computer that I can't replace and it's my only computer right now. I can't afford a new one. Help?