Thank you for your support request!
The SNMP HP ProLiant System Health sensor in the current stable version of PRTG does not work with the latest update of "HP Insight Management Agents for Windows Server" (as of version 10). We implemented a fix for this issue in the PRTG preview version that we released this week. See section "Bugfixes [Sensors]" on https://www.paessler.com/prtg/history/preview for the latest release.
Until this version 14.x.13 becomes stable, you can downgrade HP Insight Mangement Agent to version 9.60 to get the sensor working again.