i know your frustration, but it's not a simple dust problem, your dvd drive is the problem, they are not hard to replace, but before you replace it,remove it and open it up and see if there is ANYTHING visually that would cause the the drive to crash, dusy balls, dvd laser track has no lube, broken plastic, etc...... etc...... and the only other issue  that may also cause this is if the cpu's cooling fan is, stuck, simply not turning on, the ventilation air way under the fan is loaded with dust balls, etc..... the reason it might be the cooling unit is that if the systems cpu is not being cooled it will CRASH within about 5 to 8 min's every time!!!, this system runs super hot, so hot microsoft literally made 2 fixes for it, 1 being a poor excuse, they released a how to on how to over ride the systems thermostat and just have the cpu fan run at full speed 100% of the time, this was my system's fix, its a little loud but keeps it cool, the other was an external cooling fan system that attaches to the xbox's case, most people have this, there for sale at Wall-mart  pretty much everywhere. hope this helped. a2turboz@yahoo.com for all xbox-360 hardware repair questions, well all computer, game systems, laptop, basically ALL electronic repairs for every kind of device. thanks Joshua Anderson Professional XBox, XBox360, Sony PS 1,2,3 you name it .......Electronics Technician. email for anything repair related if you are stuck.