Solved BSOD After Unig External HDD, error 0x000000c5

Hi there,

So very recently, after using my external HDD my computer gets a BSOD within 10 - 20 minutes after I turn it off. It's happened about 3 times this past week, so I would like some expert opinions to help me fix this issue before it becomes more serious.

My Computers Specs:

HP Probook 4530s
OS: Windows 7 Professional 32-Bit
Processor: Intel Core i3-2310M CPU @ 2.10 GHZ
RAM: 6GB

I've attached the minidump files, I ran Bluescreen view to try and get a better understanding of what might be the issue, and it says that the driver at fault is "halmacpi.dll"

I had a BSOD issue before where my computer wouldn't start, but it turned out I was running Avast which was causing the error so I removed it and the error resolved.

Currently I am running Comodo Fire Wall and Avira Anti Virus for my PC protection. Please let me know if one of these might be causing the issue.

Another random annoyance I have is after booting my system i get an error message stating :

"HPConnectionManager.exe - Fatal Error

A fatal error occured, check the HP Connection Manager in Event Viewer for more details.

Object reference not set to an instance of an object."

I'm not really sure what this indicates, if anyone could clear that up that would be very helpful.

Lastly, and not really that important, but I've been having trouble getting my PDF Complete to actually print...if anyone could help with that you'd be my hero.

Any and all help is much appreciated, thanks!

Does the blue screen occur when using the external hard drive? Or after it's unplugged?

It happens after the hard drive is off and unplugged.

STOP 0x000000C5: DRIVER_CORRUPTED_EXPOOL

Could you please upload a .NFO file:

Start rb: > Type: msinfo32 > File, Save

http://www.sevenforums.com/tutorials/105647-ram-test-memtest86.html

Run Memtest86+ for least 7-8 passes, and preferrly overnight as it can take a while to fully complete.

Test each RAM stick individually, if an error is found then move the same RAM stick into the next DIMM slot and test again, if errors are found for the same RAM stick in every available slot then you have a faulty RAM module. On the other hand, if no errors are found in the next slot or the other slots for the same RAM module, then you have a faulty DIMM slot.

Test each RAM stick and every motherboard DIMM slot available.

x BlueRobot said:

Code:

[COLOR=red]DRIVER_CORRUPTED_EXPOOL (c5)[/COLOR]


BugCheck C5, {650032, 2, 0, 8316f795}

Probably caused by : [COLOR=Red]Pool_Corruption[/COLOR] ( nt!ExDeferredFreePool+135 )

STOP 0x000000C5: DRIVER_CORRUPTED_EXPOOL

Could you please upload a .NFO file:

Start rb: > Type: msinfo32 > File, Save

http://www.sevenforums.com/tutorials/105647-ram-test-memtest86.html

Run Memtest86+ for least 7-8 passes, and preferrly overnight as it can take a while to fully complete.

Test each RAM stick individually, if an error is found then move the same RAM stick into the next DIMM slot and test again, if errors are found for the same RAM stick in every available slot then you have a faulty RAM module. On the other hand, if no errors are found in the next slot or the other slots for the same RAM module, then you have a faulty DIMM slot.

Test each RAM stick and every motherboard DIMM slot available.

Click to expand...

Here's the .NFO file.

I'll run the MemTest and report back in a few hours.

I ran the MemTest for 8 passes and only 1 error showed. I took a picture and uploaded it (I took this pic after pass 6, but after pass 8 nothing had changed).

Which RAM stick showed the error? Did you test each RAM stick individually?

Place one RAM stick in one slot, and then test for least 8 passes again, if there is an error remove the RAM stick and then place the same RAM in stick in the next available slot; repeat for all the the slots, if there is a error for every slot then you have a faulty RAM stick, if an error only occurs in one slot then you have a faulty RAM slot.

Repeat the above process for all your RAM sticks (test one RAM stick at a time).

Post back your results.

x BlueRobot said:

Which RAM stick showed the error? Did you test each RAM stick individually?

Place one RAM stick in one slot, and then test for least 8 passes again, if there is an error remove the RAM stick and then place the same RAM in stick in the next available slot; repeat for all the the slots, if there is a error for every slot then you have a faulty RAM stick, if an error only occurs in one slot then you have a faulty RAM slot.

Repeat the above process for all your RAM sticks (test one RAM stick at a time).

Post back your results.

Click to expand...

Ok, so here's where things get interesting...

I tested each RAM stick individually (in their usual slot first) for 8 passes and no errors showed up. I only have 2 RAM sticks and 2 RAM slots. Could it be a power management issue while running both RAM sticks at the same time?

You could try leaving one RAM stick in and see if you get a BSOD.

Upload your System Specifications:

• http://www.sevenforums.com/tutorials/180324-system-info-see-your-system-specs.html

Test for corrupted drivers:

• http://www.sevenforums.com/tutorials/101379-driver-verifier-enable-disable.html

Ok, I'll run the driver test and get back to you. Thanks!

Your post #1 states you have 6 gigs of ram. Is that correct? Please install you specs as requested. Windows 7/32 and 6 gigs of ram does not make sense.

Layback Bear said:

Your post #1 states you have 6 gigs of ram. Is that correct? Please install you specs as requested. Windows 7/32 and 6 gigs of ram does not make sense.

Click to expand...

Yes, my Laptop originally came with 2GB of RAM then I added an extra 4GB of RAM about 3 months later. I've had my Laptop for about a year now.

Oddly when trying t run the System Info tool I get the error:

"Cannot access the Windows Management Instrumentation software. Windows Management files may be moved or missing."

It looks like I'm uncovering more issues with my PC than previously though

Do you still have a 32-bit version of Windows 7 installed? If so, 4GB of RAM will be recognised and 3.5GB RAM will be seen as usable. You should return the RAM if possible, or install a 64-bit operating system if you wish to use the 6GB RAM, otherwise the extra RAM is doing nothing (you can only use 4GB with a 32-bit OS).

Download Speccy, and then go to your UserCP and then click on Edit System Spec in the left pane, copy all the information from the Speccy program into the required fields for the Edit System Spec; these specifications will be attached to your every post on the forums.

x BlueRobot said:

Do you still have a 32-bit version of Windows 7 installed? If so, 4GB of RAM will be recognised and 3.5GB RAM will be seen as usable. You should return the RAM if possible, or install a 64-bit operating system if you wish to use the 6GB RAM, otherwise the extra RAM is doing nothing (you can only use 4GB with a 32-bit OS).

Download Speccy, and then go to your UserCP and then click on Edit System Spec in the left pane, copy all the information from the Speccy program into the required fields for the Edit System Spec; these specifications will be attached to your every post on the forums.

Click to expand...

Ok, I updated my system specs. Thanks for the Speccy link! It's a very helpful little tool. Also I didn't know that a 32-bit system can only use up to 4GB of RAM...that's certainly great to know for the future.

Any new BSODs from Driver Verifier yet?

Nothing yet and my system hasn't crashed yet either. I'll probably rerun it again for another 24 hour cycle once this one is completed just to be sure.

Ok, so I haven't had a BSOD error yet in the last 48 hours. What would be the next best step? It seems that running 1 RAM card is working well.

Okay seems there is no issues with your drivers, what do the sticks come like?

You have two slots on your motherboard, and the amount of RAM you own equates to 6GB; what is the amount of RAM you have installed in at the moment?

You must have a 2GB RAM stick and a 4GB RAM stick if I'm right? So, which one is plugged in your motherboard?

Good to know that you haven't had any BSODs so far

x BlueRobot said:

Okay seems there is no issues with your drivers, what do the sticks come like?

You have two slots on your motherboard, and the amount of RAM you own equates to 6GB; what is the amount of RAM you have installed in at the moment?

You must have a 2GB RAM stick and a 4GB RAM stick if I'm right? So, which one is plugged in your motherboard?

Good to know that you haven't had any BSODs so far

Click to expand...

Correct, I have 2GB and 4 GB RAM stick. Currently I am running just the 4GB RAM stick in slot 2 of my motherboard.

That's fine then, a 32-bit operating system can only recognize 4GB RAM, therefore adding the other 2GB RAM would be pointless since Windows wouldn't recognize it.

You can mark this thread as solved if you are confident that your system is now stable