BEEPS mean cpu is fine. Ram is not working. Try a single stick of ram in slot 0 aka the white ear slot nearest the cpu. Disconnect data cable from hard drive it should turn on with an error on the screen.
Hello,Hoping to find some tips here. 7010 powers up ok with no error code on the power button. The monitor is blank and the keyboard and mouse are dead. The motherboard beeps if I take out the memory. I have tried removing peripheral boards and drives with no change. Also tried with a new power supply.Any help would be greatly appreciated!!  Thanks.
Optiplex 7010 troubleshooting