the second port would be so u can plug your monitor into the port and then ur monitor gets the power from the computfer psu, noting to worry about in most case though.
Yeah, your psu should have a switch on the back of that you can slide to choose the 2 different voltages, if not, then there is a chance its inside or it may just accept both.
Correct me if im wrong but it could be the frequency cause America have 60Hz but Europe has it at 50Hz not sure if it will do anything, but it could
Intel Pentium 4 2.00Ghz FSB 400Mhz
MSI MS-6533 Motherboard
1 - Seagate 20Gb 1 - 40 gig Maxtor AND 1 Western Digital - 80 gig (Variety there eh)
Geforce 5200 128mb AGP
Liteon Dvd Burner