Im having this exact same problem. So are alot of other people it would seem. i am having it with the same ports (hdmi no go , vga ok) and with a gateweay HD2201 as well. good job billy gates.
i do know if you cant find the drivers that disabling certain power saving features like "turn off display after...." or sleep, standby and hibernate will fix it . also, try taping over this pin in your hdmi cable: https://social.technet.microsoft.com/Forums/getfile/71953
First shut down the pc and then plug in new monitor then boot up and see if windows 7 will auto find the monitor.
is this a single display or are you using 2 monitors, i had 2 monitors and used the other to change the display on mine when i had this problem i am also using windows 7 and reboot usually fixes display problems because it wont see old monitor any more and detect the new one.
also update any video drivers you have like nvidia or ati(catalyst controll center)
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