Do you still have the handbook for Dell? If so the correct procedure may be in the trouble shooting section?
if you can’t find it then here’s a brief summary.
I know you’ve switched it off but the correct procedure is best performed warm. With the device fully running and from whatever frozen screen it’s decided will be your screen saver for the day, lift the device from the desk/surface where it resides, until you can feel it’s full weight and can feel it’s warmth, as if it’s alive, make sure all cables are still attached and all relevant operating lights are fully illuminated. Do not unplug the device, I repeat DO NOT UNPLUG THE DEVICE. Grip the device, complete with devil inside it and head for the door, this part of the procedure needs to be performed swiftly, run like YOUR life depends on it. Your aim here is to rip the cables from the device so quickly and be moving so fast, that you are out in the fresh open air while the operating lights are still illuminated, at this point Dell hasn’t even got a clue what’s happening, enough residual power remains within its veins for it to think that there is no interruption to the misery that it’s causing you. And this point stop, take a breath, your adrenaline is running high, calm yourself, take a moment to look at Dell, see the once so mischievous life disappear from its operating lights, feel it’s warmth start to dissipate, savour this brief moment, the journey is nearly over, your work is nearly done. At this point you have options, it’s more freestyle, you are almost free and you can choose the next steps to accommodate your own preferences and tools to hand, but the usual method is to lay Dell gently on the ground, raise 14lb of the finest forged steel, connected to the best hickory available and violently deploy the steel into Dell (joyful screaming optional) do this multiple times until satisfied. Some have been known to take a calmer approach and simply bury Dell, others use axes, saws, presses etc etc it’s up to you, this part is all about you, release the rage that Dell has caused, in any way you see fit (this is where the joyful screaming really helps).
Procedure complete.......