Is my RGH bricked?

I followed a tutorial to update my RGH to Dash 16767. I dumped the Nand using simple360NandFlasher. I put it into the 16767 XeBuild by Domo, I entered my CPU key. Built the image and put it in the same folder as Simple360. I started Simple360 through XeXMenu and I flashed the new Nand. Now my console powers on, shows the xbox start splashscreen. Then the console powers itself off.

NOTE: The Console powers on without the HDD connected.