Using Gnome, try to use the hibernate button, system wents to sleep but i can not restart.

i have resume device in Grub (swap)

System is a Dell Optiplex 760
Grafik: GeForce GT 610, driver nouveau
CPU: Intel® Core™2 Quad CPU Q6600 @ 2.40GHz

May it is caus of wireless Keyboard and Mouse??

Where i can start to investigate?