My PC power supply, a HEC 550TD PTE model, has failed me today. My Mesh PC is an Elite Extreme SLI unit, which is just over 2.5 years old. Does this PSU have a reasonable guarantee attached to it? Otherwise, where can I acquire a replacement unit? Note I have an Advantage warranty, set up in Dec '06, 2 years on site + 1 year BTB-T&C. Any useful advice welcome.