The POST should still run at least. The RAM is first used at the splash screen. If it is your RAM then your computer will freeze or restart from the splash screen.

You've already tried another...

If it works in safe mode it is obviously not an essential hardware error. Maybe a non essential error, such as networking or something, in which case it wouldn't cause a system restart. If something...

You should be much more careful when cleaning. Some of the components you shouldn't even touch with your hands, never mind a wet cloth.

Its possible something is either damaged physically from...