Hang on...this is a known issue with a fairly simple fix: Issue may happen under two scenarios, with different root cause, but with same symptoms.Scenario 1 - Monitor being powered on 10 seconds after system has been powered on.Note: This only happens for certain monitor models (including but not limited to E2016H) due to the Hot Plug signal issue.Scenario 2 - Connecting older monitors (including but not limited to E2016H, E2216H, P2217H, P2317H) with newer video cards (GTX 1660, GTX 1660 TI, GTX 1650, RTX 2060, RTX 2070, RTX 2060 Super, RTX 2070 Super), which is caused by vBIOS incompatibility Try below methods until the monitor displays successfully:* Power off both system and monitor. Power on monitor first, then power on the system* If first step does not work, replace the DP video cable with an HDMI or VGA cable, then retry first step* If issue persists, power off both system and monitor. Power on system first, then power on monitor within 2 seconds. This method will only be applicable to certain monitors* Once the PC boots and monitor is on, update the video card's vBIOS from here Inspiron G5-5090 to resolve the issue. You'll need to know the exact video card model to choose the correct vBIOS upgrade from the list at the link (above). If you don't know it, look in Device Manager after the system boots up.
This was my experience. Ordered G5 5090 Gaming Desktop "fully loaded" on December 3rd as a Christmas gift. December 26th set up computer, would not boot- 3 yellow, 1 yellow LED on power switch. Called support. Did everything they suggested, still no boot. They recommend I return it. ~December 28th, receive box with return label, box up unit and take to Fed-Ex. Received calls saying the part wouldn't be available for a week. At end of week, pushed out another 3 days. At end of three days, part not available for another month. They offered to send a brand new system. I agreed. New system built 1-23-2020, shipped to me.  February 1st I received new system, and immediately plugged in and turned on. Same problem- no boot, 3 yellow, 1 yellow... February 3rd Called Dell. They will not refund my money, as the 30-day warranty pings off the original order date (in my case, December 3rd). They are sending me another box and label with which to return it. To say I am disappointed is an understatement. This will be the last Dell product I buy.
Inspiron G5-5090, defective shipped twice