I have just got one of these and it sounds like something is rattling on the inside. I have opened it and cant find anything wrong, just makes a loud noise when running. It plays fine.

the only one i can find on the net is the gt750e, is that what you have?
but anyway it sounds like it would be the fan.
is there anything like dust or cat hair?

also is it easy to remove the fan? you might want to try it for a few minutes open with the fan removed
to see if that's the issue, if yes then you might just need to get a replacement computer type fan that
is the correct size etc.

I am going to open it and check the fans really close. I was looking at it earlier and didnt see anything, now to fix my ps2, lol.

Hold the item upside down and shake it if there was something lose it would drop onto the table. If nothing does it might be a resonate vibration of the fans rattling something in the projector?