New
#11
You'd need both machines to have either:
A) Firewire (1394) ports, in which case you'd also need a firewire cable capable of hooking them up.
OR
B) Serial (RS232) ports, which would also necessitate having what's called a "null modem" serial cable/adaptor. Those used to be commonplace, but not any more. It's the serial equivalent of a "crossover" network cable.
Let me know which one and I'll type up what to do. Also, bear in mind that this procedure cannot identify which hardware component is responsible. It's primary aim is to conclusively establish - beyond any practical doubt - whether the reboot trigger is software or hardware. If it turns out to be software, the procedure can identify the reason for the reboot. If it's hardware, at least you can be absolutely sure of the "hardware" diagnosis.