Laptop won't boot - LogonUI.exe error

castera

Hi, hoping someone can help with this..

Toshiba Satellite Pro S500 Laptop, Win7 Pro 64bit. Has been working beautifully for months until yesterday, now won't boot at all.

From Startup, it briefly shows Toshiba logo, then starting Windows logo, then black screen with
"LogonUI.exe Application error .... ..... (0xc0000006)"
I have tried F8 Safe Mode a few times - it starts loading a couple of dozen drivers and then hangs (always at the same point), before coming up with same error message.

I had actually made a repair disk when it first arrived (:A) but of course at the time forgot about setting it to first boot from CD drive, so that doesn't work.

All the Google answers involve stuff like System Restore/Fix Registry/New install etc, none of which I can get far enough to try.

Further info: bought in April as pro refurb, with 8mb Ram and new SSD drive. Use Avast AV and regularly run AntiMalwarebytes and ccleaner.

I'd be really grateful for some suggestions as to what I could try ..

bsod

https://support.microsoft.com/en-gb/help/17419/windows-7-advanced-startup-options-safe-mode

boot order is changed in the bios, which kicks in before windows starts

castera

Thanks bsod (great name BTW, except mine's black..)

Previously F8 seemed to give a cut-down version with only 4 options, and I couldn't get further than that.

After much faffing, I now seem to have the extended screen and am trying recovery options.

No luck yet, but it's whirring away doing something. I'll report back later..

castera

Well, I got a little bit further..

System Recovery Options:

- Startup Repair: "could not detect a problem", which is good, but restart still failed again.
- System Restore: "no restore point found" - although I did think I had set something up for that..
- System Image Recovery: no image created
- Windows Memory Diagnostic: whirred away checking for several minutes, no faults found, but restart failed again.
- Command Prompt: "... for advanced users only" well, that's not me so I'm not going there without reinforcements and a waiting ambulance..

I can't understand how the above repair/diagnostics say OK, but startup still fails with same error message - either from Safe Mode or just after Windows starts loading..

bsod

safemode?
last known good configuration?

command prompt
chkdsk c: /R

Penna

bsod wrote: »

safemode?
last known good configuration?

command prompt
chkdsk c: /R

As I say, safemode gets stuck while loading drivers, and I do not have an option for "last known good configuration?"

Safemode cannot get past something called CLASSPNP.SYS, and googling that brings up hundreds of similar problems - lots of posts point to hardware issues.

Just trying chkdsk now..

Fightsback

Penna wrote: »

As I say, safemode gets stuck while loading drivers, and I do not have an option for "last known good configuration?"

Safemode cannot get past something called CLASSPNP.SYS, and googling that brings up hundreds of similar problems - lots of posts point to hardware issues.

Just trying chkdsk now..

Try an offline system integrity check:

http://mikemstech.blogspot.co.uk/2011/12/how-to-perform-offline-system-integrity.html

castera

Thanks Fightsback, but chkdsk seems to have fixed it..

(Sorry for different username upthread - been trying to login from odd bits of old/borrowed kit and lost track of who I am )

I've discovered something strange though - chkdsk c: /R reported that it made some corrections, but this didn't fix the problem. I then remembered that System Recovery Options referred to disk D, so I ran chkdsk d: /R.

Took ages, replacing dozens of bad clusters, and when finished and restarted everything was back to normal. (Many thanks BSOD for the pointer to chkdsk).

As far as I know, I only have a single 64GB SSD drive - which Win7 calls "C", but chkdsk sees as "D".

I'm curious as to what chkdsk was looking at when it reported on C: drive as 102,000 KB total disk space - any ideas?

Fightsback

castera wrote: »

Thanks Fightsback, but chkdsk seems to have fixed it.......

What's the disk management tool telling you about your partitions and disk ?

See here for info if you don't know what it is:

http://www.disk-partition.com/resource/disk-management-windows7.html

castera

Fightsback wrote: »

What's the disk management tool telling you about your partitions and disk ?

How interesting.. thanks for the link - new one on me..

Seems to say just one disk (0), in 2 parts:
(C) at 59.53GB, plus System reserved at 100MB.
All very logical and what I would have expected ie usable from a nominal 64GB SSD. Says "healthy", so that's reassuring

Just had a thought - maybe chkdsk has System reserved as "C", and the main partition as "D". That would make sense I guess and fits in with the sizes it reported.

Anyhow - all is working well again and thank you both very much for your help. :beer:

bsod

do a system image to a real hard disk, and create and test bootable rescue media, in case your ssd is flaky