Black screen on boot - FSLX.sys causing super slow boot
We have just started getting an odd problem with our PC's and laptops. Basically when a PC boots up, it displays the Windows XP logo, the screen then goes black and then it just hangs. We were struggling to figure out what the problem might be and then it actually happened to my PC.
My PC gave a BSOD and rebooted. But it wouldn't boot and gave exactly the same problem as other PC's.
The PC would however booting safe mode ok, safe mode with networking ok but not in VGA or last know good configuration. In safe mode I disabled all the services and any programs that might load up. Still no luck. I then came across this post
Which pointed me in the right direction. I performed the following to fix my problem.
1) Boot in safe mode
2) rename the Altiris SVS driver fslx.sys to be fslx.$$$ (it's located in c:\windows\system32\drivers)
3) Rebooted PC. Machine would now boot all ok
Then it got a bit tricky. I tried a the following;
4) After machine had booted all ok, rename fslx.$$$ back to fslx.sys and rebooted system
5) PC booted ok but no SVS apps were active.
6) Tried to activate them via the command line but got error message about driver filter missing. Seems that fslx.sys might not have loaded.
7) Tried to remove SVS and reinstall it but it complained saying the install was corrupt.
8) Renamed fslx.sys back to fslx.$$$ and was then able to remove and reinstall SVS
9) My own PC was ok and I was able to reactive the SVS applications. On another PC, reinstalling the SVS agent didn't seem to fix the problem and just bought it back again.
So I've figured out that the fslx.sys is causing a super slow boot process (2 hours to logon screen). This gives the appearance that the PC has hung. But I've no idea why it's causing the problem.
We run Sophos Antivirus on all our PC's (Dell Optiplex and Dell Latitude) and having read the forums, I've seen there are problems with Norton AntiVirus and Dell Core Dell PC's doing exactly this problem.
Any suggestions or ideas would be greatly apprieactied. I'm just worried that one day I'll get a call to day it's happened to 100 pc's.