Still waiting for root device
This is generally one of three things:
1. If you are using PATA (The old IDE Ribbon Cable Drives) you will want to make sure that the drive you are installing to is set to MASTER via the jumpers and the actual drive itself. Id also recommend that you have the drive on the cable's first connector.

2. If you are using SATA drives try going into the BIOS and changing the SATA Mode from AHCI to IDE.

3. Chipset related. If your booting the install disk and are getting this issue and the first two do not fix the problem its probably chipset related. In the case of SATA, some motherboards have more than one SATA control and so one or the other may be compatible. You can check your user manual or online to see if this is the case and then plug into the appropriate connector.

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MOBO: Z77MX-QUO-AOS CPU: Core i7 3770K GPU: MSI N760 TF 2GD5/OC Case: Modded MacPro2,1
Memory: 32GB Corsair Vengeance (CMY32GX3M4A1600C9) Wifi: Airport Extreme bcm94321MCA BIOS: HermitCrab Labs H3A.816M
Monitor: AOC Q2963Pm 29" WFHD 2560x1080 21:9
Interests: KDE on Apple Darwin, Keeping it real with the command line, Helping those that help themselves