I spend 6-8 hours every day working on iMac. This is the main tool in my work. And so I was very dissapointed when my iMac 2308 wouldn't start after 2 years of working.
After trying several service-centres here in Moscow (Russia) I found out that a mend would last 2 weeks and it would cost 500-800 USD. And because of this situation I decided to order PSU at iFixit.com.
I had to work temporarily on Windows (my girlfriend's laptop) while waiting for my parcel. And it was a stress-test for me.
And as soon as I got the parcel I changed PSU. It was easy with iFixit manuals. And it worked out!
I got an electric shock from old PSU on step 5. Please strictly adhere to photo-instructions (especially positions of hands on step 5 and 6) to avoid a high voltage shock.