Hello! This is my very first topic on Bleeping computer, and, beforehand, I would like to thank this community for be out there aiding all users on a very helpful way.
This said, let's down to business. A client gave me one notebook (Samsung ATIV book 4 NP470R4E-KD1BR). She said that her mom was using it and probably clicked on something and then it was not booting no more.
With the notebook on hand, I saw that it did boot, but after the splash screen the computer stays forever on a black screen with only a moveable cursor. I let this black screen for two hours and nothing happened. Task manager does not appear (Ctrl+alt+del or ctrl+shift+esc), ditto GUI elements. All advanced boot options are useless. The output is the same. As for Windows Repair Environment, startup repair can't identify a problem, system restore "do not found any restoration point", there's no image for a complete restore, memory diagnostic it's way not the thing here (since I highly doubt it's a RAM problem) and on CMD I tried already a chkdsk /f /r, /fixboot /fixmbr, see if shell is okay, and on some crazy internet advise, change permissions (which I could not complete due to "No mapping between account names and security IDs was done").
I had to use Hiren's boot CD (so to speak, since this notebook doesn't have a CD/DVD driver lol) to access few important files for my client (only .docx and PDFs). I know I should not do it, but I ran Roguekiller from this environment (scan only) and it notified me there was a rootkit and needed to restart. Which is pointless, since the environment would be gone, as it is a live cd.
I tried pretty much what I know on this scenario... still the only thing changed was that the black screen no more stays forever, but instead, the notebook reboots, go to black screen again, stay there aprox. two minutes, then reboots again on an endless loop.
Since I'm out of ideas, and I don't want to format the whole thing, I am asking for your help. Go soft on me, please hahaha. I'm not familiar with the log tools used here, so any guidance is not an exaggeration. Keep in mind too that the only bootable device (except the HDD) it's a flash drive.
Thanks, one more time, and cheers!