Well this might be a problem of how you installed it. I'm not that familiar with iAtkos... I know I tried it once and didn't like it on my system... but then again, I use an AMD processor. When you boot up and go to Disk Utility, can you see your disk on the left? If you can, select the disk (not the partition) and look down at the bottom of the Utility window to see what kind of Partition Map Scheme it is. When installing windows on your machine, it is going to require MBR instead of GUID (which is favored more by Mac OS X, but not required).

If you decide later to not include Windows (but to rather use VMware Fusion to allow you to run Windows from within OS X) like I did, then I would say to go ahead and just install Mac to your system cleanly (without any other partitions including anything else) in a GUID Partition Scheme (because then you can edit this easily to add partitions for linux later).

That was a mouthful... whew. Any questions?

EDIT: The blinking underscore is your computer telling you that it can't find a bootloader for your system on the hard drives.

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