Static Flashes

Same issue for me, with static flashing every 5 seconds; hard reset is only a temporary fix. It seems to happen every few days. I should also mention that I'm a an early preview program member, so I'm hoping the fix will be coming soon.

 

So I think this might be a possible solution:

"Step 1: Clear persistent storage.- go to Settings >> Disc & Blu-ray >> Persistent Storage >> Clear Persistent Storage. Do this step 3 times.

Step 2: Clear alternate MAC.- After you are done clearing the Persistent Storage, go to Settings >> Network >> Advanced Settings >> Alternate MAC >> Clear Alternate MAC >> Restart.

At this point your Xbox should be rebooting.

Step 3: Unlink your account from the Xbox (Yeah! I was concerned about this step, too. But, don't be "Skird").- So once the Xbox is done rebooting, go to Home screen and sign in to your account. Once logged in and still on the Home Screen go to> Settings
> Security and Passkey > (on the middle left part of the screen you will see) “Remove me from this Xbox” > Remove my account.

Step 4: Redownload your profile.- All right, once the profile has been removed, it will automatically sign you out. So let's redownload your profile back! Click Sign in, the 2nd icon on the upper left corner of the screen > Add New > Enter your email and
Password. Entering this information will prompt you to redownload your profile automatically. In the process it will refresh both your account and the system, as well. After you added your login information, you will be presented with 3 options, "make it
fast," "check that is me," or "lock it down." I selected the "check that it is me" option. I was then asked to setup a new six digit code. You have now completed all the troubleshooting steps, and your system is ready to be tested and used.

Step 5: Enjoy!!"

Source:
forums.xbox.com/.../4866925.aspx

 

Scratch my suggestion above. The problem went away for a little while but then came back. I've also tried swapping cables, ports on my tv, but still no luck. One thing I realized thought was that I had my color depth (Settings, Display and Sound) set to
36 bits per pixel, and I've dropped it back down to 24 bits; we'll see if I have better luck with this option.

 

I have had this same problem - fixed by unplugging kinect but then has come back again later