On Tue, 2004-08-31 at 03:08, Arjan van de Ven wrote: > > CONFIG_HIGHMEM=y > > CONFIG_HIGHMEM64G=y > > these don't exist for x86-64 !!!! Hi Arjan & others, Thank you for setting me straight on this issue. I guess it was just a coincidence that some of the kernels worked with mem=12G and others didn't. I've moved the machine to a new location and now *none* of the kernels I have (neither mine nor the Fedora ones) will boot with "mem=12G". The best I can get to work is "mem=3950M". I'll try re-seating the RAM and see if that helps. Ed -- Edward H. Hill III, PhD office: MIT Dept. of EAPS; Rm 54-1424; 77 Massachusetts Ave. Cambridge, MA 02139-4307 emails: eh3@xxxxxxx ed@xxxxxxx URLs: http://web.mit.edu/eh3/ http://eh3.com/ phone: 617-253-0098 fax: 617-253-4464