Dayz crashing my whole PC and no error message

[Cooliodann 0]

When i play dayz mod or arma 2/OA my whole PC crashes

When it crashes both of my screens freeze and if there is any noise at the time it repeats for about 5 seconds

My PC stays on but my mouse,keyboard and screens freeze so i cannt do anything

i have re installed all mods and Armas

i have tried a different hard drive

i have tried different Ram

i have reinstalled my drivers

i have water cooling on my CPU so it isnt getting to hot

my graphics cards also don't get to hot as this doesn't happen on any other game even ARMA 3????

Please HELP!!!