Hi, I'm Mr.med. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
i'm sorry about the issue, what is the model and brand of your laptop or desktop ?
Please try the steps below :
1. Shut down the computer.2. Unplug the computer's power cord.3. Wait 20 seconds.4. Attach the computer's power cord.5. Wait 5 seconds, then press the power button to turn on the computer.6. Press and hold the Command-Option-P-R keys before the gray screen appears.7. Hold the keys down until the computer restarts again at least twice.8. Release the keys
Let me know the results
Has everything worked out,do you still need help please?