Toshiba travelmate 4740, about 1 year no used. Now I charge it and try to power on but don’topen it. After full charge, I continue the charging and about 1 hour later I again press power button and power light blip when press. Then I continue the charging and about 2 hours later, laptop open. But after shutdow, same problem occored. Need about 2-3 hours charging, then it open. What should i do.