Running a 220v computer in a 110v environment

If there are no input voltage selector switches hidden inside on the PSU and you are reluctant to use a transformer then there's no way to run it directly from 115V mains.

This could be for an air conditioner as the larger A/C's are usually 220V units. Just check with your landlord. If for sure a 220 outlet for A/C then first determine if the input to the PSU is fused (a fuse is A Good Thing). Next, have an electrician friend get a correct connector and _correctly_ wire it up and you're good to go. If there is no fuse protection in the PSU perhaps your electrician friend could devise an NEC-correct box to fit between the outlet and the PSU. Safety is A Good Thing especially to prevent damage to the unit and minor things like fires, your death, etc. Another thing to consider is whether the PSU will run well on the North American 60 Hz line frequency instead of the 50 Hz used in most of the rest of the planet. If the AC input rating label says something like '220 V, 50/60 Hz' or suchlike, then you're okay. You see, if the PSU is transformer-based (not a switching PSU like you see on all PeeCees) then there _may_ be a dependancy upon 50 Hz only as the tranny was possibly designed just for 50 Hz. If the company's designers were considerate of the unit running in other parts of the earth, then they could have specified a 50/60 Hz tranny. You should check this.