i've samsung multimedia keyboard, now its 3 year old....... sometime its NUMlock light get ON, and freeze my all buttons for few seconds, and sometime CTRL button get auto ON, whenver i type anything it start beep sound.... Shoud i buy new keyboard or something wrong from my PS/2 cable?? or motherboard is faulty?? and also my optical mouse sensor is not working good.... it is not working on plane plywood surface of table, but working fine on any card-board/little rough magazine/ Greeting cards/textbooks etc. i mean it working good on little rough surface, i'm facing this problem from 3months... my mouse is 3 year old!! Is censor can be changed by any computer mechanic???? or shoud i buy new??? if yes in both case, then plzzzzzzzzzz tell me lowest price of optical mouse nad any type of keyboard!!