Major USB problems

[Brizzles]

Having some major USB issues over the last couple of weeks

1) Mouse freezes for a second or so

or

2) Mouse freezes for ~5 seconds

but more frequently

3) Both mouse and keyboard freeze up and both 'flash' ( the keyboard is illuminated and the mouse has lights ), not a pulsing flash but random flashing.
The only solution then is to take them both out and plug them into different USB sockets .

This fixes the problem temporarily

The flashing indicates, to me, that a signal/power is getting through but not constant.

Have tried ;

CMOS reset ( battery out etc. ) - No Fix

Reinstalled Windows - No Fix

Updated mobo drivers - No Fix

Replaced the Ram - No Fix

Flashed to latest F7 bios - No Fix

At a loss now for what to do ?

Would be very grateful for any/all suggestions

Thanks.

( Intel i5 2500k / Gigabyte P67a GD4 / Win 7 x64 )

 

[Brizzles]

Borrow a different mouse/keyboard

Mouse and keyboard both work fine on laptop

Check your memory, I had loads of strange problems like this and more and it turned out to be a bad stick that thanks to ocuk is now heading back to be replaced download memtest and check it out

Memory has just been replaced with new stuff, Windows Memory Diagnostic Tool gives it the OK ( it found faults on my last sticks, hence these new ones )