I'll post my setup to begin with, which may help troubleshooting:
2203334 BenQ TFT 24" GL2450 1 st
4304006 2TB Seagate Barracuda 7200rpm SATA 6Gbit/s 1 st
4304431 A-DATA SSD Premier Pro SP900 128GB 1 st
5305768 A-Data S102 Pro 16GB USB 3.0 1 st
5322073 Cooler Master TX3 EVO 1 st
5409469 Gigabyte GeForce GTX 670 2048MB OC 1 st
6101093 Microsoft Wireless Desktop 800 1 st
6901319 Fractal Design Define R3 USB 3.0, Vit 1 st
8300470 DVI kabel ha-ha 2m 1 st
9990250 Montering och test av dator med valfria komponenter 1 st
1902185 MSI Z77A-S01 ATX 1 st
5310020 Intel Core i5 3570K 3,4Ghz (Ivy Bridge) 1 st
5315229 Corsair 8GB (2x4096MB) CL9 1600Mhz VENGEANCE LP 1 st
6901005 ESD-armband för montering av dator 1 st
6909705 be quiet! Pure Power L7 630W 80+ Bronze 1 st
On my laptop I've always installed windows by a USB, very comfortable! Because of this I didn't order a CD/DVD to my new machine.
Anyways, I start up my new computer with my USB version of WIN 8 inserted(from official website, also the USB-tool). I hit F11 and choose the USB-stick to boot. The windows logo appears and the installation begins, i choose my SSD as a new/fresh installation. It starts copying files and everything seems just fine. One of the steps in the installation process is for the machine to reboot.
1). If I keep the USB-stick as bootprio #1 the installation will start from the BEGINNING over, and over again.
2). If I have my SSD as bootprio #1 I get a blackscreen with the words "insert bootable device"
Just to be clear. You have set the USB drive as the boot drive within the BIOS? When I have used a DVD for install, during the install the machine reboots several times and needs to be able to access the DVD. Therefore I assume it should also access the USB.
Is the install on the USB an upgrade version, or an unofficial copy of the Windows O/S?