Firstly I am not sure if H.P. will take it in and repair/replace it with it being an import, although it should not matter as they are worldwide. So I would suggest contacting them about it.
Alternatively you could change the power supply unit yourself.
But bearing in mind that once the case has been opened by anyone other than H.P. it could void the warranty.
P.S.U's are pretty cheap from any computer peripheral shops and are easily replaced. All you do is remover the sides of the destop unit and unscrew the P.S.U. from the back, disconnect all the wires to the motherboard, hard drives, CD drives and Floppy drive. Read the label on the side of the unit and buy one with the same power output. Replace the unit and reconnect all the wires. Dont worry it will be set up for U.K. voltage so no need to change it. PLEASE NOTE. Damage may have been done to the motherboard when it blew, but in most cases the P.S.U's inline fuse normally goes before that happens. But you will not find out until a new unit has been put in. Hope this helps.
PcPhil
January 2008
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix desktop pcs.