Same problem. Not only when closing the slider, but also if left in sleep mode for more than 30 minutes. Took into retail repair store and they were clueless. they told me they fixed it by moving the ribbon on the back. I closed the slider while I was there and it went to the back light and had to do a hard reset to get it to power up. I left and called my Sprint store where I purchased and they just got in a few more Pres about 10 minutes earlier. I swapped my Pre - Palm Profile restore went smooth - and no more problem.
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