This is an odd computer problem. My computer will randomly shut itself off. It will shut off at different times too. Sometimes in the middle of POST, sometimes when I am logging in, and sometimes when I've been messing around in Windows for several minutes. At first I thought it was the power supply, which I checked by using a different power supply, same problem. Then I noticed something weird, when my computer was lying on its side it never shut-off but when I put it upright it shuts off at random points. I've tested this several times and this hypothesis seems to be correct. Now I have checked and rechecked each cable and each one is secure. Before this problem started happening I had my computer upright so I dont know what happened. Any help would be much appreciated. Thanks.