Ok, I just bought a 16x dual layer dvdrw drive and ever since I installed it (2 days ago) my computer will only work when it is horizontal (on its side). If it is vertical, it does not function. If i move it from horizontal to vertical while it is on, I can hear something (presumably the hard drive) sound like it is shutting off and when it returns to a horizontal position I can hear it come back. Do you know what is wrong/what I should do?