actually, all R710 systems come with the drac express installed, so you can clear the logs using that. There are 2 ways to do it., you can reboot, and during the bootup process, before the OS starts to load,  you will be prompted for the Cntrl-E to enter idrac screen. Once in that screen, scroll down to System Event Log menu, hit Enter on that, then scroll down one to clear the system event log. The other option assumes you have conncted a lan cable to the system and configured an IP address for your idrac (which can be done in Cntrl-E, Lan paramters), then you would sign into the drac via your browser by entering the IP address of the drac (root/ calvin is the default username/password), then click Logs tab, then scroll all the way to the bottom and choose Clear logs. FYI, you can also set the idrac to have an IP address (DHCP or static) using the front LCD panel. press the check button to show Setup, press again to show idrac, then left or right to select dhcp or static, then press again to save. 
I have a Dell Poweredge R710 with an amber warning light showing : I1912 System Event Log full, Review & clear log. I cannot use Dell Open Management Server Administrator on this server as the server is locked down. I do not have an iDRAC card in this server either. What I’m looking for is a bootable CD with the options to view/clear the System Event Log. Does anybody know if one exists. Thanks  Bernie
Clearing System Event Log on Poweredge R710