What could be the problem?
Solaris runs in 64bit mode, I've enabled VT-x. I've tried running OpenSolaris, Ubuntu as well as Windows Server 2003 in a VM, all abort as soon they initialize the kernel, or in case of Windows, when the setup is done loading the system files and starts the kernel.
If I had to guess, VirtualBox isn't able to figure out the processor type and enable VT-x. Disabling it doesn't even result in a warning and it starts the VM nonetheless.
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hyperborea:~ > psrinfo -vp
The physical processor has 4 virtual processors (0-3)
x86 (GenuineIntel 10677 family 6 model 23 step 7 clock 2667 MHz)
Intel(r) Core(tm)2 Quad CPU Q9450 @ 2.66GHz
hyperborea:~ > isainfo -v
64-bit amd64 applications
sse4.1 ssse3 cx16 mon sse3 sse2 sse fxsr mmx cmov amd_sysc cx8 tsc fpu
32-bit i386 applications
sse4.1 ssse3 ahf cx16 mon sse3 sse2 sse fxsr mmx cmov sep cx8 tsc fpu