Time to call Apple on new iMac slowness?

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From your previous thread:

"It has three gigs of ram (added a 2 from OWC...Random crashes"

- Go back to the original RAM only
- Erase (or reformat) the internal HD
- Install Leopard, fully update it, and repair permissions
- Let it complete its indexing and other housekeeping tasks

- restart

If you now find it's fast and stable--and I think you will--you know where to look for the culprits...