Holding I button will only reset iDRAC. Doing this will not result in server reboot or iDRAC default. more details available in below link   If you want to reset iDRAC you can also run the below command after login to iDRAC with SSH racadm racreset
Hi there I have a Dell 620 server, where the iDrac will not login, I get the login page and add the credential, but it just never responds. Anyway I know I can reset the iDrac by holding in the little 'i' button on the front panel, but I need to know the consequences of doing so... Will this re boot the server? Will this reset the iDrac settings back to default? If it resets it, does it just restart the iDrac and let me using previous settings? Many thanks people, Kev    
Resetting the iDRAC