For a lot of people, switching the hardware health polling to CISCO-ENVMON-MIB has corrected the warning messages for hardware status - check out the posts on Thwack - 10.4 hardware health monitoring - anybody know what a bias current sensor is?
As for the CPU and memory, go to the node summary page and click on list resources
Do you have the CPU & Memory selected?
If you do and are still not getting any information, you can run snmpwalk.exe from the Orion server (C:\Program Files (x86)\SolarWinds\Orion) and check if the OIDs for CPU and memory are in the output.
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