Black screen on boot

[Asgard_thor]

I accidently downloaded a virus and need some help

I was going with this thing, how to remove it, and of course some software takes a reboot. so it rebooted to a Black screen and just my mouse on the screen..

I think a boot file or something got delete..
please help me guys

[Asgard_thor]

also, I cant get into safe mod at all, same thing happens

I can get into the repair console with my windows CD but dont know what to do..

[WoZZeR999]

When you have just the black screen, can you use Ctrl+alt+del? Windows Key + R? something may have happened to explorer.exe if you can launch those.

[Asgard_thor]

yup tired thought and also tired crtl+ alt + f2

I thought I found this webpage how to use the repair console to write new files, but I cant seem to find it again..I know the first command, I think was mp tmp or tmp mp ? :/

also, I saw that you can get into the window setup-press enter, and press R to repair, but my drive is showing up as unknown for some reason..I dont know why..

[Th3MadScientist]

where does it black screen? Before the Windows splash screen, after the splash screen? Need to be a bit more specific on what happens. Usually if you just boot into a black screen your registry hive is corrupted. You are going to need to delete the old hive and copy the fresh files the Windows has backed up when you first installed. Try this. If its an software issue this should eliminate your black screen, ive done this countless of times on clients computers who had viruses and it works but then you can have other strange behavior after the black screen.

when you are in the recovery console you want to navigate to

C:\Windows\System32\Config

type in

dir

You should see 5 files

default
SAM
SECURITY
software
system

You do not want to delete them, just rename them to the .bat extension
so your gonna type in

ren default default.bat
ren SAM SAM.bat
ren SECURITY SECURITY.bat
ren software software.bat
ren system system.bat

then type in

dir

again to make sure those files were renamed. Once its confirmed your gonna type in

cd C:\Windows\Repair

once there type in

dir

you should see the files your just renamed, default, sam, security, software and system, they are in the repair directory for this exact problem, they are backups that Window did when you first installed.
All you need to type in now is

copy default C:\Windows\System32\Config
copy SAM C:\Windows\System32\Config
copy SECURITY C:\Windows\System32\Config
copy SOFTWARE C:\Windows\System32\Config
copy SYSTEM C:\Windows\System32\Config

it will copy those files into the config directory and rebuild your hive. Once copied exit and try again to boot and see if you get any further, if you get a lsass.exe error, you have got the Sasser Worm and its time for a reinstall.

[jbartlett323]

the reason your drive is showing up unknown is probably because it is a SATA drive with a controller that your CD does not have a driver for... If Th3madscientist's methode doen't work you whould try to find a Makedisk for your board and hit f6 when first loading windows setup to load from a floppy... yeah this method sucks so i would try his first!

[Th3MadScientist]

please dont use the repair function on the Windows disk, 75% of the time it gets stuck with an error and your worse off because if you reboot it will always go back to the install screen and always have the same error and it will not let you go anywhere else and then you are really gonna have a fun time getting your data off the drive and reinstalling.

Every black screen that was not hardware related and I used my method solved the black screen issue although 50% of the time the client had the Sasser Worm which would give the login a lsass.exe error which currently there is no work around or patch.

[WoZZeR999]

the reason your drive is showing up unknown is probably because it is a SATA drive with a controller that your CD does not have a driver for... If Th3madscientist's methode doen't work you whould try to find a Makedisk for your board and hit f6 when first loading windows setup to load from a floppy... yeah this method sucks so i would try his first!

It didn't show up for him because his NTFS partition table was broken. There were 2 partitions, and it saw 1, so it wasn't due to a controller. I've got him to the point to where once it is recovered, we can set it to active, use Th3MadScientist's method, and hopefully all will work well after that.

[Th3MadScientist]

any updates ?