I have an HP Pavilion Slimline s3600f. When I put the computer into sleepmode, I face a problem. I can't get the computer to get out of sleepmode. The only way to get it back is to turn off the computer with the power switch on the surge protector. I checked the hardware settings of my mouse and my keyboard and they are enabled to wake the computer out of sleep mode. I don't know what's wrong. What should I do?