vista laptop could not be started up after putting it to sleep mode..

hi, I too use vista for my laptop and if i am not wrong i hope the problem may be due to power option. What is the power plan you are using? Its Ok once check the power option i hope you know the procedure. If not controlpanelharware and settingspower options there on the left side you will be given options like...Choose what the power button do option...there see when you press sleep button .. change the option if its not in sleep..Also check power button option..if that is in shutdown or do nothing option you may have this problem. If you still face any problem see the power plan settings too. Hope this will work..All the best.