Hi,
Please do try these troubleshooting steps that may help in solving the issue.
- Start by doing a hard reboot, remove the battery and unplug the AC adapter then press and hold the power button for 20 seconds then try logging in again.
- If it doesn't work try logging in Safe Mode. While the laptop is booting up repeatedly press on F8 until it loads Advanced Boot Options and select Safe Mode.
- If it doesn't work in Safe Mode last resort would be to do a factory reset with your laptop.