no system disc (Intel i7 GA-EX58-UD5)

@willsimonSo, you'd better post your problem in detail such as the words on your boot screen, and other people can help you base on your situation. p.s. According to my experience, maybe you should active your partition(use google ). Or you may install the boot-loader.

The boot screen says as follows:

Non-system Disk
Press any key to reboot

That is all it says I am assuming I installed a boot loader PC EFI V9 but I may be wrong on what this exactly does.

Well just kinda wanted to give you guys an update seems you guys have been checking this post. I installed Kubuntu with grub hoping maybe it just needed to a bootloader and still no dice is there something I am missing it almost seems as if I am just missing the boot manager (as it would be called for windows) but just can't seem to find it again guys any help would be great thanks.

been a couple days still haven't gotten a response so I will just update it this one last time and ask for help. I believe I figured some of it out. I tried iDeneb with the same result what seems to be happening is that I am installing then when it comes to restart to complete the install the computer turns off then on and then crashes and reboots back to non-system disk (or it would say that if I didn't install Kubuntu on my other HDD) any help or info would be great guys thanks.

So, you'd better post your problem in detail such as the words on your boot screen, and other people can help you base on your situation.
p.s. According to my experience, maybe you should active your partition(use google ). Or you may install the boot-loader.

Here the same. But it worked for me once. The only problem was after installation the waiting for root device error. So i reformated the disk. After that it started to be strange. I could install it once more with the same result as you. And now, after one more reformating the hdd I even can't install because it's saying hfs_mountroot failed 5 right after the install starts. how do u format the disk?

Sorry to reply you so late.
I think you should active your disk partition.
First, when you installed, you formatted (erased) the partition using Disk Utility. Attention, you should choose MBR（Option in the Partition tab of Disk Utility）
after your installation
boot with your Leo DVD,

Press -S
fdisk - e /dev/rdisk0
flag X(your leo's partition)
update
write
reboot

FYI, there is a excellent guide for you http://www.insanelymac.com/forum/index.php?showtopic=14… ↗
You should check it out, and maybe there is something can help.