Yesterday I installed Ubuntu from a USB flash drive. Now, when I turn on my notebook, it displays only `_`. When insert the USB drive it's ok.

I tried changing BIOS settings: some booting options, but it didn't help.

What should I do to make it possible to run without the USB flash drive?

Thanks in advance :)

---

Thanks but it didn't work properly. Boot Repair wrote "EFI detected. Please check the options." I don't know if it's important... after command

```
sudo fdisk /dev/sda

```

it answered: 

```
Command (m for help): m
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

Command (m for help):

```

So I chose `sda`. Then it said something like 

> 
> if any problems - <http://paste.ubuntu.com/1027567/> or boot.repair@gmail.com or my favourite discuss forum. 
> 
> 
> 

Then: 

> 
> You can now reboot your computer. Please do not forget to make your BIOS boot on sda disk!
> 
> 
> 

What has happened? what should I do? it again wasn't able to run without USB. Thank you