Thank you for your kind respomse. I can't get into Safe Mode by tapping on the F8 key during boot up after several trials.
"Leaving USB port connected to the Vaio"
I connected my printer via USB port and also a wireless keyboard. My friend told me that I should disconnect those device before changing my laptop on standby or hibernated. Otehrwise, it may disturb the laptop to go back to normal mode later.