Dell Optiplex 9020 SFF beeps once and fails to boot up

Symptoms of the issue:

Dell Optiplex 9020 that does not boot up properly. When the power button is pressed here’s what happens and keeps going in a loop:

– Keeps doing a single beep

– Power button blinks amber and then blinks white

– Hard Drive symbol blinks white

– PSU LED blinks green

– CPU and Case Fans spin briefly and then stop

Resolution of the problem:

1. completely turn off the computer
2. disconnect the power cable
3. leave the power button pressed for 30 seconds + to discharge all the funny capacitors and the energy that remains in the components
4. open the case cover and carefully remove all the RAM/memory sticks
5. turn on the computer, it will beep once, then several times (3 continuous beeps), there should not be any video on the monitor, leave it running for 1 minute and later turn off the computer
6. open the device again and place a single memory stick (might want to consider cleaning the memory connectors with an alcohol wipe carefully, let it dry for a minute before re-inserting). Place the memory stick into position 1.
7. re-connect the power cable and turn on the computer, this time there will be video on the monitor, likely with a memory change message, press F1 button and it will continue to boot.
8. if everything worked, turn off and repeat the steps to re-insert the rest of the RAM/memory sticks.