All you have to do is Google search 'IMVU badge'. There is a website dedicated to listing out available badges (free, for trade or buy) called The Bling Directory. From...
Click on the link in the "Sources and Citations" section at the end of the article. There is a good photo panel on that page showing what each step looks...
It depends on what is dead. If it has damaged capacitors and other components it might be fixed, but replacing the PSU is the safest and probably easiest method.