If you are getting the underscore in the upper left corner of the screen the laptop is not froze, however it cannot find an OS (Operating system- aka windows) This leaves us with 2 possible options:
1. Your system (Bios) has changed boot priority
Depending on your computer you may get a prompt to press a key to change the boot order, if this is the case make sure your C: drive is selected, or Hard disk drive as it is a laptop you should only have one.
If you do not get a prompt for a boot priority screen you will have to enter the BIOS or system setup, this is ussaly done by pressing "Delete" or "F2" when you first boot up you will see the screen and it will tell you what key to press. Go into the bios and look for the boot priority settings and make sure your hard drive is at the top of your list
2. Your computer's hard drive has been corrupted and you may have to reinstall the OS.
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That blinking cursor is the way in which the BIOS is telling you that Windows is not loading because its most critical, core files have been corrupted beyond repair. The only thing you can do is to reinstall using the recovery cd or your own Windows install disk.
You can try to boot to safemode. When you turn on system as soon as you see Dell logo keep tapping F8,select Safemode under advance boot option. If you we're able to log in to your account you can try to uninstall video driver and restart the system to normal mode then reinstall the video driver.
If you we're not able to boot to safemode , you can try to connect to external monitor toggle to FN+F8 if still not showing anything might be a bad video card.
Turn off the laptop and keep pressing the F8 key to get to the boot menu. At that point, choose safe mode. If you can get into safe mode then go into system restore and choose the last date that the laptop was working properly. The system will reboot at that point and hopefully it will go into windows normally.
If you can't get into safe mode then that means windows is corrupted and you'll need to wipe out the hard drive and reinstall windows and the device drivers for your hardware.