Finding a replacement fan
At bootup, my DN2820FYKH reports “WARNING : CPU FAN Stopped. Press the Enter key to continue”.
Do you know what’s a compatible replacement fan for this model? I couldn’t find one through obvious searching.
Have you checked if there is a part number somewhere on the fan?
Looking at this link (not for your model) the part number is on the barcode sticker on the fan shown in the image i.e. 1323-00U9000.
This was found by a general search online for the part number only.
Maybe worth a look if you haven't already done so.
Here’s a link to the user guide that may help with opening the device.
Here’s the technical product specifications. See p.13 for the fan. Unfortunately there are no part numbers in this document.