hi recently i found a very strange problem,when i start my system,it shows bizzare screen like all characters mainly dominated by "!!!!!" and rt rt rt and some nonsense characters,it takes me to dual boot menu,where i could read xp or 2000.But under this menu again all nonsesne characters.i opened my cabinet and cleaned the dust around RAM.and changed the slot also.But it re-occured.so i detatched keyboard and mouse. and re-attatched.it worked.But again if i restart,same old story repeats,i am vexed how many times i have to unplug and plug removing keyboard,is it keyboard problem.or RAM? when this problem occurs in the booting my mother board logo also wont appear.all !!!!!!!! characters.plz help me out.

does it proceed to boot when u select the desired OS?

No it wont ,key board wont work.Thatz why i shut down the pc,removed keyboard jack,plugged again restarted,some times it goes normally ,and sometimes wont.Hope u got me.