Here are the flags in the cpuinfo file, looks like the CPU has the PAE support: $ grep pae /proc/cpuinfo flags : fpu vme de pse tsc msr pae mce cx8 mtrr pge mca cmov pat pse36 mmx fxsr sse up or, maybe I am missing something here? Any helps will be appreciated. Mike Robert Story <rstory-l@2006.revelstone.com> wrote: On Sat, 21 Apr 2007 20:44:41 -0700 (PDT) Yuming wrote: YF> After installing xen, I cannot boot into the xen kernel. This is on Insprion 4100 laptop, running Fedora core 6. I seem to recall that FC6 has a PAE kernel, and many/most laptops don''t have PAE support in their CPUs. --------------------------------- Ahhh...imagining that irresistible "new car" smell? Check outnew cars at Yahoo! Autos.