turn it off, hold in the power button until it beeps once twice and then a 3rd time, take your finger off. then hold it in again you will here it beep once then a short time after a second beep and a short time after that two close beeps take your finger straight off, ur system will turn on it will give u a list starting with restart your system, go for rebuild data base hope this help, u can try them all if this doesnt work