OC caused problem

Sep 3, 2018
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so i have gigabyte r9 390 8gb. i overclocked its memory clock for a bit and the screen went black even after restarting and unplugging everything. system boots fine but there is nothing in screen
 
Next time use MSI Afterburner. You have three ways to fix it:
1. Take out GPU > Use onboard graphics if it has one > Reset OC or delete wattman
2. Safe mode > Reset OC or delete wattman
3. Plug your boot drive to another computer > Delete wattman