Keyboards, both old and new, do not work, just dead, and nothing helped

[Windows 10]

I have Windows 10 on Dell desktop. My wireless keyboard stopped working a week ago. It just died suddenly. I changed batteries - twice, put receiver in different port ,ran a scan which said that device is working properly while it was completely dead. Checked for driver updates and it said that the best drivers already installed. The mouse works fine, and it is on the same receiver. Uninstalled and reinstalled device. Rebooted computer. Nothing helped. Since nothing helped I thought that maybe something happened to keyboard itself and ordered a new keyboard the same day. Today it arrived and i

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