Black Screen blinking cursor on boot

Viruses and worms
1

The problem started about 3 days ago… When I started my computer I was getting BIOS beeps… I checked manual and it was either Memory or CPU Thermal Paste … so I reapplied thermal paste ( there was no burn marks when I checked), restarted still beeped. So I took one piece of my ram out (4 single 1 gig ram) and rebooted… the beeping stopped. Windows did not boot up. I put the single back in and still no beeping.

All I got the screen after my bios showed up was a black screen, with a blinking cursor.

So I thought it might be the harddrive, was going to format and put windows 7 on… when I discovered that there was a memory repair tool in the Windows 7 boot disk. Did that, came back 100% fine and after using it, my computer booted into windows. I was able to run Skyrim / BF3 with no issues.

Currently I can login to windows 7 if I boot from CD rom and ignore the prompt to use the boot disk.

Which leads me to believe its not hardware but a virus/worm. I ran a deep Avast scan… and did a boot scan in addition. A potential trojan was found, deleted and deleted all the files that avast had problems scanning in case. Rebooted and still get the same issue.

Is this a fault with Windows 7?

I was reading another forum where someone used Avira and it was able to fix the problem that sounded like this.

Just wondering if this is a known issue? Any help would be appreciated.

???

2

I am now doing a scan with:

Malwarebytes Anti-Malware 1.51. http://filehippo.com/download_malwarebytes_anti_malware/

3

It found 2 that avast didnt bring up, “Riskware.tool.ck”

Removed both

4

After deleting files, some part of the booting process could have been corrupted (not in the sense of an infection, but in the sense that a file is not valid anymore or that some file is not present, or that some configuration file doesn’t contain the appropriate info anymore).

JFYI, about MBAM, you need to update it before running it, so to cover all possibilities.

About the specific malware, someone else may be of help.

5

Thats may be a indication of MBR Infection…

Clean up your CPU and just get rid of any dust on the drive or motherboard

I ran a deep Avast scan... and did a boot scan in addition. A potential trojan was found, deleted and deleted all the files that avast had problems scanning in case.

[b]Give us some info on it.

1]location.
2]file name.
3]Infection name.[/b]

At the end attach malwarebytes and aswMBR logs here on next reply…

6
I ran a deep Avast scan... and did a boot scan in addition. A potential trojan was found, deleted and deleted all the files that avast had problems scanning in case.

Win32:CodecPack-AH [TRJ] in a file called F:\Music\MISC\BillBoard Songs\extract.7z>extras.exe it was hidden in with a billboard mp3’s

Oh yeah after that reboot last night, still getting the same issue.

Just scanned, attaching the file

7

Oh yeah, I did clean up the box a bit too with Dust Off when the Bios Beeps occurred.

I never ran that EXE btw (I am the only user)

8
..... deleted and deleted all the files that avast had problems scanning in case. .....
are you saying that avast found some files it could not scan....and you deleted them ?
9

Yeah they were juse useless things, like in game rars that I have had on here for a very long time, just cleared up space. Rainmeter

Didnt delete/uninstall windows files

10

when avast report file(s) it can not scan…and the reason why…it does not mean they are infected

11
Currently I can login to windows 7 if I boot from CD rom and ignore the prompt to use the boot disk.
When you try to boot normally what error do you get ?

Boot from the CD

When you reboot you will see this although yours will say windows 7. Click repair my computer

http://i1224.photobucket.com/albums/ee362/Essexboy3/RepairVista_7275.jpg

Select your operating system

http://i1224.photobucket.com/albums/ee362/Essexboy3/RepairVista_7277202.jpg

Select Command prompt

http://i1224.photobucket.com/albums/ee362/Essexboy3/RepairVista_7277.jpg

At the command prompt type the following

Bootrec.exe /FixMbr

[*]Once finished type Exit

Reboot to normal windows and run MBRcheck again please

12

thanks for joining the topic essexboy :)…is this a case of MBR infection???

13
When you try to boot normally what error do you get ?

It goes pass the bios screen, and just Black screen with blinking cursor in top left corner. Thats if I have the boot setup to use Harddisk first… I can only get passed this by using Boot from Rom in the bios settings.

At the command prompt type the following

Bootrec.exe /FixMbr

[*]Once finished type Exit

Reboot to normal windows and run MBRcheck again please

Restarting now… brb.

14

That is usually the indication of a corrupt or missing MBR

15

It said successful

Changed bios setting to start with Harddisks first and still got the cursor in the corner.

Does this mean ill have to format and do a fresh install?

So weird, because I can use windows if I boot from *cdrom and just skip it.

16

OK lets try another bootrec command (the next in the chain )

Restart from the cd and get to the command prompt again
This time use the following command

Bootrec.exe /FixBoot

17

Restarting now

18

It said successful

Restarted with Harddisks as boot priority 1 and got blinking cursor in corner again

19

OK final shot as we try to rebuild from scratch : Again from the recovery disc command prompt

bcdedit /export C:\BCD_Backup
c:
cd boot
attrib bcd -s -h -r
ren c:\boot\bcd bcd.old
bootrec /RebuildBcd

20

When Doing cd bOot says cannot find Path specified

I am on my hand held