Can you discribe your Problem a little bit more detailed please?
When did it work the last time and what happend before it stopped working?
If there was a power outage your flat screen maybe died because if it (short circuit for example)
If your gpu cant handle the high clock then you have to go back by a few mhz...
You can try to increase the Voltage and Power Limit in MSI Afterburner but other then that there is no easy way to fix that.