I thought I’d note, don’t give up on this if you have this problem. I figured my player was dead, since it had gone green screen all the time, and the computer couldn’t see it when it was plugged in. I was going to call customer service to see if anything more could be done, but then noticed, out of the blue, the player, which had been connected to the computer all night with a green screen, had turned off the screen. I turned it on, and it showed the USB plug graphic indicating it was plugged in, with the battery charging animation. However, there were no words on the screen. I used other buttons to navigate, and it navigated among screens and menus, but with no words anywhere.
If you get to this state, your Sandisk Sansa window should be up on the computer, too. If so, don’t unplug the player! Go get the firmware MANUAL updater from Sandisk, download, extract, and move it to the root directory of the player. Then when it’s done transferring, unplug, wait for it to turn off, and turn it back on again according to the manual update instructions. This worked for me. The player seems to be working again.
…that’s the important stuff. But I should mention there were two further steps in this saga before I got there. The plugged in screen showed up, I looked around on the player, then tried to use the Firmware Update link on the Sandisk Sansa window that comes up automatically when the player is plugged in. This did not work - it gave me a file not found error. I downloaded and ran the Firmware Updater Installer, but running it did absolutely nothing. Finally, I decided to try a normal reset. I unplugged the player, and pressed the power switch to turn it off. It went green screen again. And stayed. I decided to give it another chance with similar circumstances to revive as it had before, and a few hours later, again without warning, it did. At that point I was ready with the manual update .bin file and the instructions on the website. And it seems to have worked. So… DON’T unplug the player if you’ve got it to be noticed by the computer again after a green screen failure!