Restarts from fastboot when connected to USB topic

Hi, I hope someone can help, because this looks like a strange one. I was not able to find something similar to it.

I attempted to unlock the boot loader and install TWRP. This worked fine. But I noticed that the fastboot icon changed from being a gray CM face to a white one. That was done using using the Toolbox v6.

I later noticed that some android apps are listed as not compatible with the device. So I thought I'll reverse the process. So I plug it in, and clicked lock boat loader, did a restart; wanting to to flash the stock-recovery. My goal was to reset it back to normal.

The issue I have now is that whenever I try to fastboot, it boots into the white CM face, and the second I connected to the computer via USB, it restart. If I try to hold power+volume up again, it just goes black and does not restart. When I unplug the USB, it restarts again.

How can I get it to reboot into fastboot and remain in fastboot after being connected to USB?

Any ideas? The tools listed in this thread:
http://forum.xda-developers.com/onep...ation-t2843675

require that I fastboot, then connect to the computer. but my very issue is that when it connects to USB it just restarts.

Any ideas?

Thanks,
Maher