Theres a multitude of problems that can prevent a computer from waking up from sleep. Here are a few fixes ive seen: new drivers (acpi, and oddly enough video drivers) new bios revision, cant think of any more off the top of my head. You may also try using standby and hibernate, if one works, just disable the other one.
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Laptop: Lenovo T420 - Core i5 2520 - 8GB DDR3
Server: 2 xeon E5530 - Asus Z8N-D6 - 12GB DDR3 - 8x 500GB raid 50 - Perc 6/i - Compucase RA448A00
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