 Dell has stopped using all beep codes except for the Memory Failure code. (1, 3, 2, or 1 beep, then 3 beeps, then 2 beeps.) If your system was built after 2012 and is making any other beep code, please contact technical support for further help.  [URL]
We have a not very old Optiplex 3060 with a power led flashing twice amber then seven times amber. Service tag  SERVICE CODE,  no internal leds are on. the power appears to be going to the board, cpu / case fans spinning.  I've googled the led flashing twice...then 7 times and can't find what this is code for 
Optiplex 3060 power led flashing twice amber then seven times amber