FreeBSD 5.x-6.0 Unable To Boot

[Nicholas Lozinsky]

On a Compaq Presario M2000, using a Sempron 1.6Ghz CPU with 512 RAM,
I am unable to install any copy of FreeBSD from 5.0 up to 6.0 Release.
Somehow, the 4.9, 4.8 and below, are able to install. The init gets
stuck at:

sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 8250 or not responding
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port many not be enabled
Timecounter "TSC" frequency 1600064074 Hz quality 800
Timecounters tick every 1.000 msec

freezes here.....

Any suggestions? Thank you.