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No keyboard/mouse response during boot

HP Recommended
Compaq-Presario CQ5305UK
Microsoft Windows 10 (64-bit)

OS = Lubuntu (=Linux Ubuntu variant) + Windows 10.


Problem =Keyboard (KB) + mouse (Ms) seem to have no power during boot (inc during dual-boot Lubuntu grub menu, so no response to pressing esc or F10 (or any key) when want to enter bios (cmos) menu.

KB + Ms work fine once booted into Windows 10 (or into Lubuntu).


Dual-boot grub menu currently set to go into Lubuntu, which it does fine and then works fine,

but cannot move cursor to select windows in grub menu (becaus no response then to KB and Ms).


I have tried reseting cmos by removing battery etc (as per instructions found online

+ by moving jumper (as per onine instructions).  Gives no change.

+by booting with HDD disconnected.

Have tested same KB on another PC, when it does work properly during boot, so the problem is no the KB but something about this PC.

CMOS battery not suspected because no other cmos low-charge symptoms.


Worked fine until about 1 week ago after hoover "dusted" inside case using vac and soft brush.

Everything else seems to stil work ok.  Problem is just KB and Ms ignored during boot.


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