5.3B2 with PAE won't boot

[Kachun Lee]

Hi,

I embedded this problem in my previous thread. I got a E7501 single XEON 
3GHz 6G RAM upgraded from 4.10 to 5.3B2. It was running without problem 
since Friday. I tried enabling PAE and it hanged during the turning icon 
(before displaying even 'KDB: debugger...).

This morning, I tried all other boot options (safe mode, no ACPI, single 
user, extra log) in the beastie screen but they all hanged without any 
extra output. Any hints in what should I try.

Regards
Kachun