Hi - I have a P7P55D motherboard on a desktop, maybe 6 years old, Running Windows 7 professional. The PC seems to be going into sleep mode but not waking up. After a power off/on cycle it comes back - until the next sleep timeout. Have just changed the sleep setting to Never, see if that works. However is there a diagnostic that can be run or other tool? Or any advice from you? Thanks - PJ