optiplex 780 windows 7 blues creen with Core 2 Quad Q9300 processor

Hi geminiliow,

Dell has tested Optiplex 780 system with the following quad core processors :

Q8200 Q8300 Q8400 Q9505 Q9550 Q9400 Q9650

Note : Dell does not recommend or offer processor upgrade but it is as per your discretion in case you really wish to go ahead with it. Warranty per say, issues arising due to the upgrade will not be covered under warranty , however we will continue providing support for other issues and parts. 

The bluescreen error message may indicate an issue with the hardware or video drivers. You may follow the steps below to  verify the hardware functionality :

• Power on the computer
• Press F12 button when you see Dell logo on the screen
• Highlight the Diagnostics option and press Enter
• Note down error messages if any and reply with the outcome

As you have upgraded the processor, I would also suggest you to check if the heatsink is connected firmly to processor and if the processor fan is running. If not, please reseat the processor and reconnect the processor fan as the error might be related to overheating of processor. You may refer to Service Manual Here.

Note : Please follow the safety instructions in manual before replacing parts in system.

You may also try to run the computer in Safe Mode and see if the issue persists. For starting the computer in Safe Mode, you may refer to article Here.

Please reply with the findings. Will take it further from there.

thank you to reply, i will try to Diagnostics it.

the pc currently is running with core 2 quad Q6600 without any problem,

but when i upgrade process to Q9300 it blue screen and try to format also come out with same problem.

bios update(A14) also cannot solve the problem.

hi I have solve the problem, one of the Q9300 processor core is fault.

I change optiplex 780 bios --> performance --> untick the Multiple CPU Core.

but what happen will cause the processor core fault?

Hi geminiliow,

Disabling multi core in BIOS was a wise move. Glad that the system looks stable now ; thank you for confirming. Since, the system started crashing after processor upgrade, it points at a possible issue related to processor. I still recommend you to monitor the system for a few days and check if the issue reoccurs. In your previous reply, you have mentioned about attempting a format. Could you provide more details about what exactly happened? Did you try re-installing Windows OS using re-installation DVD's?

For more decisive results on the actual cause of bluescreen error message, I need more information on the error. Please follow the steps listed below to capture and share the relevant details:

1. Crash Dump data:
- Click 'Computer'
- Navigate to C:\Windows\Minidump and tap
- Copy all the 'Minidump' folders and paste them to your desktop screen
- Please send these folders to me (I am sending my email address through a private message)

2. MSINFO32
- On the 'Start menu' (Windows), type 'MSINFO32' in the 'Search text box'
- In the 'System Information dialog box', on the File menu, click 'Save'
- In the 'Save As dialog box', make sure that the file type is 'System Information File (*.NFO)'
- Enter a name for the file > Click 'Save' and share the file with me

3. Event Viewer
- open the Event Viewer by going to start->run->eventvwr

- Click 'Save Log File As' (*.evtx)

4. Windows Update History logs:
- On the 'Start menu' (Windows), type 'windowsupdate.log' (without quotations) in the 'Search text box' > click OK > Save the file in text format (.txt)
- Share the log files 

5. DxDiag file:
- Tap key combination
- Type 'DxDiag' and tap 'Enter'
- In the 'DxDiag window', click 'Save All Information'
- Save this file to your 'Windows desktop' and name it 'dxdiag' and share it with me.

I am adding you as a friend. Please accept my friend request by clicking on my name highlighted in blue and then click on “Friends” tab at the top and then click on “Request to Review” and finally click on “Accept” button. I am sending you a private message with my 'Email address'. Click on “Inbox” to find my Email. Please attach the mini dump folder and email it to me directly.

Do reply with the results. I would be glad to assist.

the system before upgrade processor

after upgrade processor with enable multi core at bios, it come out blue screen I mentioned like the picture at previous post.

yes, I have try re-installing Windows OS using re-installation DVD's but also come out with same blue screen error.

after disable multi core at bios the system is scucess to login to windows.

I did not receive your friend request and private message, can u resend it? so i can send the system info to you.

Hi geminiliow,

I am glad you've found the information helpful. Feel free to reach out in-case you need any further assistance.

thank you to help.

i have try the processor on other system, and i have confirm that is the processor problem.

If the Q9300 is at fault, I would just send it back for a refund if possible.  The reason is that the Q9300 is hardly any better at all than the Q6600 and not an upgrade path you should follow.  The only reason to get the Q9300 is if your Q6600 had failed. The Q9400 is the lowest you would want to go for an upgrade and only if you could find a good deal for one on ebay.  I overclocked my Q6600 and it benchmarks the same as a Q9550, but I realize you can't do this on your Dell system.  The point is that you would never notice a difference between the Q6600 and the Q9300 with day to day tasks or even gaming for that matter.