External display blinking on Macbook Pro Late 2008.

Hello,
Firstly, computer specs:
Macbook Pro, 15-inch, Late 2008
GPU: GeForce 9400M / 9600M GT
8 GB RAM
320 GB Hard Drive
On Mavericks v10.9.3
I want to connect my computer to my TV via a mini displayport to HDMI adapter, for gaming purposes. As such, I want to use the 9600M GT as my GPU. However, when I am in High Performance mode (which uses that GPU), the TV screen blinks on and off every couple of seconds. I have tried resetting my PRAM, which failed. I know it is not the adapter, because it functions when used on another laptop. I know it isn't my port because it works when in Battery Saving (using 9400M GPU). Can anyone help?
In short:
Late 2008 15-inch Macbook Pro, GeForce 9400M / 9600M GT
Mini displayport to HDMI functions when on Battery Saving (GPU = GeForce 9400M)
However, external display blinks on and off when on High Performance (GPU = GeForce 9600M GT)

Hi mjbecker2,
Welcome to Apple Support Communities!
The article linked below has some tips that  may help you resolve the flickering issue that you are seeing on your TV.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
No video or no signal, image distortion, "snow," or flickering
Check connections
When using an external display be sure to check the following:
If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.
Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:
Monitor and Display Adapter Table
About Mini DisplayPort to HDMI adapters
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
Thunderbolt ports and displays: Frequently asked questions (FAQ)
Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
Try unplugging the video adapter or cable and then plug it back in.
If more than one video adapter is in use (or "daisy-chained"), troubleshoot by using only one adapter.
Example: A mini DisplayPort to DVI adapter connected to a DVI to HDMI adapter is an unsupported configuration because there is a series of adapters in use.
If available, try using a different display and or adapter (or use a different connector by using DVI instead of VGA, for instance).
Cheers!
-Jason

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