TRY
We have faced similar issue, following will fix the the issue.
1. Ensure that the SNMP service is Enabled
2. Reinstall HP Insight Management Agents
http://h20564.www2.hp.com/hpsc/swd/public/detail?swItemId=MTX_f33486c6dab6413380ab3afa69
3. Launch the SMH page and Login