Restart by error code

I’m sorry to hear that you’re experiencing issues with your Dell Optiplex 745 desktop. According to a post on BleepingComputer, you can try the following steps to resolve the issue:

1. Switch off the computer and disconnect the power cable from the wall.
2. Press and hold down the power button for 15 seconds.
3. Reconnect all the peripherals and check if the system switches on.

If this doesn’t help, you can try running a hardware diagnostic test or checking if there are any diagnostic indicators that can provide insight into the issue ². If none of these solutions work, it might be worth considering taking your desktop to a professional repair service.

I hope this helps!