hi, i recently upgraded from XP to 7. In Xp, i'd put the computer to sleep and it would wake up normally. now, it will wake up, my monitor will come on, but instead of displaying the windows 7 desktop, the monitor simply says "no signal" and powers down, like its still in sleep mode. i know it has woken up, because my power light stops blinking, and i can hear my processor kick on. some help would be appreciated. thanks.