Currently we exclusively work with HPE branded servers. The servers we sell come with at least iLO version 4 (IPMI).
In order to access the IPMI of the server, log in to the portal, go to the server and click the IPMI button under Remote Access:

You will now be automatically logged into the IPMI, no user credentials needed. Finally you will see the following:

Now in order to access the console, click on HTML5 here:

Now you have access to the console, in order to mount an ISO we recommend to use a remote URL:

After mounting the ISO, start the server with Momentary Press:

Note: Press F11 to access the boot menu, then select the Virtual CDROM as boot device.