Cisco 6506 keeps powering down because it says I have a Fan Tray 2

Hi Experts,

I have (2) 6506 chassis with (1) 1300W DC PS and a (1) Regular fan tray in each.  When I power Chassis 1 on with a SUP2 the log at boot up says that it will initiate a power down in 300 seconds because the power supply is not compatible with the fan tray 2. If I take the same equipment (fan Tray, PS and SUP2) and put it into Chassis 2 everything boots fine. It will warn me in the log at bootup to make sure the fan tray and PS are compatible, but it never initiates a power down. The problem seems to lie in Chassis 1 because no matter what combination of fan and PS  it initiates a power donw.
Has anyone ever had this issue before? I have searched the internet but cannot find anything that duplicates this issue. Any help would be appreciated.

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Don JohnstonInstructorCommented:
Please post the output of a "show mod" on both chassis'.

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VardataAuthor Commented:
Thanks for the  response donjohnston. We actually had to replace the whole chassis because after further testing one of the slots was found to be bad. Not sure if this had anything to do with the fan tray and PS issue ,but the new chassis works without a hitch. Since you are the only one to respond I would like to give you all the points even though there was no resolution. Thank you again!
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