My Toshiba Satellite C50-B-14-D won't power up
I recently had to replace the screen then I turned on power

The power button came on for about 10 seconds then started to flash
Somebody suggested that I should remove the battery and charger then hold power button for 30 seconds now my laptop won't power up

But the USB ports will charge my mobile phone with the power cable plugged in but not with just the battery
Can anyone help