I have formatted and copied windows 7 to my 4GB USB key and I have installed a new HDD into my Dell Optiplex 745. When I boot up the computer I am notified with: PXE-E61: Media test failure, check cable PXE-M0F: Existing Broadcom PXE ROM I have searched and found out that this can be caused by a bad hdd but this can't be the case seeing that I literally opened it new from it's packaging and instantly installed it. Also I heard that in order to install via USB you need to place USB to #1 in boot sequence. I have tried this but when I do this all I get is a screen with a flashing underscore at the top of the screen and I can't do anything. So I changed my boot sequence back to the way it was: 1. Onboard or USB Floppy Drive (not present) 2. Onboard or USB CD-ROM Drive 3. Onboard SATA Hard Drive 4. Onboard Network Controller 5. USB Device I have no backup disk and I have no access to a Windows 7 DVD, all I have is it on USB. Any help would be greatly appreciated.