Hi, On 09/17/2011 02:52 AM, Thomas Dukes wrote: > It won't boot CentOS 6.0 64 bit, Scientific Linux 64 bit 6.1, but will boot > 32 bit CentOS 6.0. Can you expand a bit on the 'wont boot', actually expand quite a lot. Run the installer in debug mode and turn off all rhgb, quiet etc and see what point and how far the system gets. Also, some manufacturers have been known to turn off 64 bit ( lm ) support in BIOS when the device is sold with a 32bit Windows. Make sure that its not the case. Finally, you mentioned 5.7 but didnt say what your test results there were. Does the 5.7/x86_64 installer boot for you ? if not, how far does it get ? is that about the same point as the 6.0 installer ? - KB