Force HDMI output

I have a gigabyte GA-MA785GM-US2H motherboard with onboard radeon hd4200. It has built in HDMI out. The trouble that I am having is that at times, randomly it wont detect anything being detected over HDMI and will swap over to VGA mode. Best case scenario I would like to force HDMI output no matter what, if not I was able to connect a VGA cable to my display however the resolution is different. If I must do it split like this I would like to be able to run two separate resolutions. I would like 1080p over the hdmi and 1600 x 1200 over VGA as opposed to being forced to max out the VGA resolution and carry it over to the HDMI, Thanks for the help.
I have already swapped out HDMI cables.
Adam


Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: AMD Phenom(tm) 9650 Quad-Core Processor, AMD64 Family 16 Model 2 Stepping 3
Processor Count: 4
RAM: 3581 Mb
Graphics Card: ATI Radeon HD 4200, 512 Mb
Hard Drives: C: Total - 238472 MB, Free - 115504 MB; F: Total - 238472 MB, Free - 80899 MB; K: Total - 2861575 MB, Free - 874552 MB;
Motherboard: Gigabyte Technology Co., Ltd., GA-MA785GM-US2H
Antivirus: Microsoft Security Essentials, Updated and Enabled