Smell coming from power supply

I noticed a smell coming from the computer yesterday. Today i determined that the smell was from the power supply. Now...my Imac does fall in the range of products for the video and power repair extension, but i just worried about letting my power supply completly melt down before i can get service for it.
So i guess i have few questions i would appreciate any help with.
1. Is this a regular symptom of the known power component issue.
2. Is there a danger in continuing to run the Imac.

Jason:
The PSU problem is different and separate. Call Apple and get a new PSU. If you continue to use the computer the PSU will stop working and it may do harm to the midplane.
Regarding the midplane. You can discuss changing it when you talk with an Apple technician. But if there is no problem with the screen and although your computer has a serial number that is included in the recall, I assume Apple will not change it. But, you may argue, the burning of the PSU may have affected the functioning of the midplane and Apple may change both. It is worth a try.

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