Dear Friends,

I have Ubuntu 12.04 lts and windows 7 in dual boot mode controlled by ubuntu on dell inspiron 1521 machine. While i was working on the machine i restarted the machine and selected ubuntu but it got hung up on the black screen. Now everytime i restart the machine UBUNTU does not start and the black screen appears.

Please suggest what can i do???

This may not be your problem and may "bork" your system. Use at own risk.

From here: http://askubuntu.com/questions/16207...have-to-fix-it

"Black/purple screen after you boot Ubuntu for the first time
This usually happens because you have an Nvidia or AMD graphics card, or a laptop with Optimus or switchable/hybrid graphics, and Ubuntu does not have the proprietary drivers installed to allow it to work with these.

The solution is to boot Ubuntu once in nomodeset mode (your screen may look weird) to bypass the black screen, download and install the drivers, and then reboot to fix it for ever.

Start your computer, and press the Right Shift when booting up, to get the Grub menu. Use the ← ↑ → ↓ keys to navigate/highlight the entry you want (usually the first one)."


SCREENSHOTS


"Find the linux entry as shown above, use the ← ↑ → ↓ keys to get to it, and then press the End key to get to that line's end (which may be on the next line!)."



SCREENSHOTS



"Enter nomodeset as shown, and press Ctrl+X to boot to where you can successfully install your graphics drivers.
If you are running Ubuntu 12.04 or 12.10, and have a ATI/AMD graphics card, you have to follow the instructions here, otherwise you will run into this problem every time you restart your computer."

Dear Friend,
I have tried the samething that u suggested but in nothing improved. Moreover, this is not the first time i am booting the machine it's working from last 1 year and had no problem. But yes i had AMD Radeon Graphics on the machine.

Please suggest any other option!!!!!

Regards,
AGK

Friend, I'm afraid I'm out of suggestions. The above worked for me on my old laptop with Nvidia drivers. Can you login to a cli (command line)? It might be a pain but you probably should save your data and try a re-install with 14.04.2 to see if you get better driver performance.


As regards the "first boot" issue. 12.04 LTS worked perfectly fine for me for a number of years before becoming dodgy.

When you say it boots to a black screen do you mean completely black or is this the normal tty login screen?