Been having this recurring problem with my system for a while now and don't know what to try. Some examples of what happens are: -In game the screen will go black and the monitor will display "no signal". Sound will continue to play and I guess I can continue to use the system but i have no idea what is happening as nothing is shown on screen. Only solution is to reset. -In game the screen freezes in a stripy brown/green screen and the last <1 second of sound is looped infinitely. Only solution is to reset. Sometimes the system resets itelf. -In game the screen will go black (I believe no signal to screen as it goes to standby after a while) and the GPU? fans will spin up faster for a few seconds. The system is unusable. Sometimes resets itself. Only solution is to reset otherwise. It can happen after 5 mins into a game or several hours. I don't remember it having any problem using normally for browsing etc, just in game. I thought it was the GPU as it started about the time I got a new card (Gigabyte Windforce HD7850). I contacted Gigabyte but they sent me some generic reply about checking the system isn't overheating and is the system getting enough power (how am I supposed to test that?). My case has plenty of airflow and I re-seated the heatsinks with new paste to make sure. I put tape on all the spare connections of the PSU to try and rule out shorting on the case. I tried running it on the other PCI connection on the PSU. I guess the it could be on the way out but it's not that old. No other component has changed since this GPU was added to the system. I have tried re-installing the card and updating drivers + BIOS etc but with no luck. I am pretty confident that it is not overheating as I have good airflow through the case and it has been regularly cleaned of any dust. Sorry for the lost post but I know tou need as much info as possible to get a good picture of what is going on. So...any ideas guys?