trying to use HP ZR30w monitor with Roku express. Purchased DVI-HDMI, Display Port to HDMI and USB to HDMI connectors. This monitor does not have HDMI port. Have tried all 3 and cannot get "display" to work. Roku is plugged in using one of these HDMI adapters. Monitor Power light is on, but screen is blank. Getting info from HP is impossible maybe due to age of monitor. It's a great monitor and would like to use for watching Roku. Any suggestions on what I'm doing wrong or how can I find out if monitor is compatible to use?