Q: mac book pro flickering connection

Hi, dschoendorff.

Thank you for using Apple Support Communities. 

I would need a little more information to provide more resources to troubleshoot this issue.  However, here are a couple general troubleshooting articles that may help. 

Intel-based Macs: Resetting the System Management Controller (SMC)

http://support.apple.com/kb/HT3964

Apple computers: Troubleshooting issues with video on internal or external displays

http://support.apple.com/kb/ht1573

If none of the above resources provide a fix for this issue, please reply back with the model of your MacBook Pro along with what version of the operating system you are running.  The first article below will show you how to identify which model you have. The second article will show you how to locate which configuration you have. 

MacBook Pro: How to find the serial number

http://support.apple.com/kb/HT1559

Tech Specs

http://support.apple.com/specs/

Cheers,

Jason H.