[ovirt-users] issue to access to F5 menu with the console

Hi all, I had trouble on a centos vm this morning, and as I used to do, I tried to enter into the interactive boot menu at the begining of the sequence boot so as to deactivate a service. But F5 just balances between the text console and the centos progression bar, and I've not been able yet to access to this menu. I've tried with SPICE and VNC console, but the issue is the same. How can I do this like on any centos system?