hi sir mere pc me back side ki sari usb port kabhi to chal jati he kabhi nhi chalti ek beep sound ata he to chal jati he fir beep sound dobara ata he aur band ho jati yaha tak ps2 keyboard wali port me sam problem aa rahi 6 usb port he pichhe sab me ek y sath problem he kya wajah ho sakti he