2.6.18.1 linux hangs

In FC6, some times the linux hangs at bootup after the "Uncompressing linux ..." and before the "Red Hat nash version ..". It's not happening always, I've enabled kernel debug and loglevel to print more detailed information. If it hangs again, I would attach the detailed log information. Throw some light on what could be the issue, so that I can debug more on this. CPU info: # cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 14 model name : Intel(R) Core(TM) Duo CPU U2500 @ 1.20GHz stepping : 12 cpu MHz : 1200.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc pni monitor vmx est tm2 xtpr bogomips : 2403.04 processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 14 model name : Intel(R) Core(TM) Duo CPU U2500 @ 1.20GHz stepping : 12 cpu MHz : 1200.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc pni monitor vmx est tm2 xtpr bogomips : 2400.22 thanks in advance, Antony Rheneus