I had this last week, sometimes white dashes, sometimes a white mesh effect
over the screen. But the machine would freeze up.
Bottom line I took it back to the shop and they swapped it over for a new
one with no hassle.
I had a couple of months warranty left so that was okay.
I took a picture of the screen and showed it to the guy in the shop and he
reckoned it was hardware failure.
So if you have any warranty left I'd get your machine back to the shop and
change it for a new unit.
Not impressed with the 360 after this though. Mine had only seven months
light use before it rolled over on it's back and bit the dust.
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