Black Screen w/Mouse (only if lan cable plugged in)

[thepregnantgod]

I'm hoping someone can shed some light on this very frustrating issue...

System: Win7x64 pro, 32gb RAM, Asus Z77, i7 2600k. Normally boots in less than 60 secs

Now, today it will boot to a Black Screen with a movable white mouse arrow (not a blinking cursor).

BUT ONLY if the NIC is enabled and the LAN cable is connected. If I unplug the lan cable or disable the NIC in the BIOS it boots fine. Additionally, if I leave the NIC enabled but unplug the lan cable until AFTER it boots to the desktop, I'm fine. (Thus, I can't assume it's a driver issue. Something is happening upon boot via the network.)

I've looked in the Event Viewer and can find where I have to power off the system via a hard reset and I can see errors when it boots and it sees the NIC unplugged but I can't find anything else.

Something else, it only happens on my User Account. I created another account (aptly called Black Screen) and it booted fine with the NIC enabled and plugged in.

I'm running NIS2012, updated and have done a full scan twice now.

Finally, thinking it was a startup service/program under my original user account I used msconfig to disable all non MS services and disable every startup. It still booted to a Black Screen w/cursor if the NIC was enabled and plugged in. Furthermore, Safemode w/o networking is fine but safemode w/networking has the same problem. BUT ONLY IF THE NIC IS PLUGGED IN AT BOOT - NOT AFTER THE BOOT.

Edit: updated Malwarebytes - scanned and found nothing.
Used MS Security Essentials - scanned and found nothing.

Any ideas?

 

[noidea_77]

Do you use a fixed IP address or DHCP? If it' a fixed address, check if it is a twice in your LAN. If it is DHCP, check you router config.

 

[ss202sl]

It seems to be something in your profile. wonder if you were to use the profile migration wizard from your profile to copy your profile to a newly created profile if it would have the issue on the new profile.

 

[thepregnantgod]

1. I do use assigned IP addresses. Checked router to see if it was added twice - it wasn't.
2. Assuming it is something with my profile as it uses the same IP address/router connection just under a different profile. Would like to identify what it is with the profile - if I rebuild/migrate I'm going to add everything again anyway so I'd like to know what to avoid.