usb keyboard and mouse not working after boot or sleep

I have a new Dell Inspiron 2350
windows 8.1
for the last week or so the usb wireless keyboard and mouse do not work when the system is booted or after coming out of deep sleep mode. I have to unplug the usb dongle and plug it in again for them to work.

I have already checked the powering saving settings for these devices, and it is disabled.
There is no setting in the bios that I can see which would cause this.
I have re-installed the drivers.
I have tried different USB port.
Dell have even replaced the keyboard and mouse and batteries, same problem.

Anyone got any other ideas?

Check your Bios settings to make sure that Legacy USB is on. Also there are issues still to this day with Dell computers and Windows Sleep mode. Did you install any manufacturer software for the keyboard? Make any changes to USB device management in Devices or in the Power Profile?

It does help to know the manufacturer & model of the USB keyboard and mouse. That way if someone else is having issues and sees this thread. They can hopefully see a solution if we find one.

hi,

there are no legacy usb options in the bios.
As I mentioned the issue alos occurs every time I boot the machine.

As I also mentioned, I have already checked the power settings for these USB devices, and the power saving setting is disabled , which is the only suggestion I have found elsewhere relating to this issue, so there was nothing to change there.

It is a dell keyboard and mouse.