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Windows 7: My computers only detects one Processor.

15 Apr 2010   #11
squall leonhart

Windows 7
 
 

well if hes on x64, it should have the x64 hal installed anyway which will readily adapt to core changes where normal.

does the core count list the second processor if you enable it again op?


My System SpecsSystem Spec
.
15 Apr 2010   #12
CommonTater

XP Pro SP3 X86 / Win7 Pro X86
 
 

Quote   Quote: Originally Posted by MichaelMarr View Post
Quote   Quote: Originally Posted by CommonTater View Post

Been in your BIOS lately?
I'm guessing that you have hyperthreading support disabled.
I am not a very advanced computer user and I have never modified/used any BIOS settings before so i apologize if i am coming across as annoying with my lack of knowledge on this.
No need to apologize... It's must my normally gruff manner popping through...

Anyway... When starting up, most computers will flash a first screen saying "Press DEL to enter setup" (or sometimes it's F2)... You have about a 2 second window during startup to nail that key... and your computer will enter the BIOS settings instead of the operating system.

Now you are going to be in unfamiliar territory here... 1) Don't Panic, 2) Don't go changing anything you aren't sure of... It's unlikely you will harm your computer from here, but you can certainly get it to behave very strangely... so proceed with caution.

Look through the various menus and see if you can find a setting for either "Hyperthreading" or "Hypertransport"... the options will be Enable or Disable (or in some BIOSs it's Auto and Disable)... set this setting to it's ON state.

Now press F10 and you should get a box asking if you want to save settings and exit... say yes then let your system boot normally.

What's your CPU count now?
My System SpecsSystem Spec
15 Apr 2010   #13
MichaelMarr

Windows 7
 
 

Quote   Quote: Originally Posted by CommonTater View Post
Quote   Quote: Originally Posted by MichaelMarr View Post
Quote   Quote: Originally Posted by CommonTater View Post

Been in your BIOS lately?
I'm guessing that you have hyperthreading support disabled.
I am not a very advanced computer user and I have never modified/used any BIOS settings before so i apologize if i am coming across as annoying with my lack of knowledge on this.
No need to apologize... It's must my normally gruff manner popping through...

Anyway... When starting up, most computers will flash a first screen saying "Press DEL to enter setup" (or sometimes it's F2)... You have about a 2 second window during startup to nail that key... and your computer will enter the BIOS settings instead of the operating system.

Now you are going to be in unfamiliar territory here... 1) Don't Panic, 2) Don't go changing anything you aren't sure of... It's unlikely you will harm your computer from here, but you can certainly get it to behave very strangely... so proceed with caution.

Look through the various menus and see if you can find a setting for either "Hyperthreading" or "Hypertransport"... the options will be Enable or Disable (or in some BIOSs it's Auto and Disable)... set this setting to it's ON state.

Now press F10 and you should get a box asking if you want to save settings and exit... say yes then let your system boot normally.

What's your CPU count now?

I entered the settings and i can't seem to find it, I tried pressing four different keys because the key's you mentioned were not in any of the options to enter various menu's at the boot screen. In the BIOS screen i couldnt see anything that had "Hyperthreading" or "Hypertransport". Perhaps I have overlooked it but i did spend some time looking at all the options.
My System SpecsSystem Spec
.

15 Apr 2010   #14
MichaelMarr

Windows 7
 
 

Quote   Quote: Originally Posted by squall leonhart View Post
Check the Computer item in device manager and post whether it says uniprocessor compatible acpi system or multiprocessor...etc
It says ACPI compliant System for both.

And the OS is Windows 7 Ultimate so i dont' see any HAL option.
My System SpecsSystem Spec
15 Apr 2010   #15
squall leonhart

Windows 7
 
 

it should be ACPI x64-Based PC for a 64bit multicore processor.

I wrote up a guide on how to change this on XP, using devcon, unfortunately i don't think the exact same steps would work on Windows 7.

You can try updating the computer type via the driver update wizard, but i suspect the only fix will be a reinstall of windows.
My System SpecsSystem Spec
15 Apr 2010   #16
MichaelMarr

Windows 7
 
 

Quote   Quote: Originally Posted by squall leonhart View Post
it should be ACPI x64-Based PC for a 64bit multicore processor.

I wrote up a guide on how to change this on XP, using devcon, unfortunately i don't think the exact same steps would work on Windows 7.

You can try updating the computer type via the driver update wizard, but i suspect the only fix will be a reinstall of windows.
Yeah you're right it is a ACPI x64-Based PC. Updating the computer by the driver update wizard didn't work as it says i have the best avaliable driver.

I don't think I will be able to reinstall windows As I have no installation disc, I guess I will just have to take it back to PC World.
My System SpecsSystem Spec
15 Apr 2010   #17
squall leonhart

Windows 7
 
 

well before you do that, create a Restore point, then uninstall the computer type in device manager,

on reboot it'll probably reinstall every PnP driver on the computer, but if anything will fix it, it would be that.

Edit

before doing that, make sure single graph per core/cpu is enabled in task manager.
My System SpecsSystem Spec
15 Apr 2010   #18
not so gray matter

W7 Ult. x64 | OS X
 
 

Yeah the setting he's talking about is Task Manager > View > CPU History > One Graph for Each CPU.
My System SpecsSystem Spec
15 Apr 2010   #19
MichaelMarr

Windows 7
 
 

Quote   Quote: Originally Posted by squall leonhart View Post
well before you do that, create a Restore point, then uninstall the computer type in device manager,

on reboot it'll probably reinstall every PnP driver on the computer, but if anything will fix it, it would be that.

Edit

before doing that, make sure single graph per core/cpu is enabled in task manager.

I have created the restore point and as for the Single graph per core i cannot select the option the writing is grey and when the mouse is hovered over it, it doesn't change at all , although there is a little dot next to it which im guessing indicated it is already selected? And im sorry i don'y fully understand what you mean by uninstalling the computer type i tried right clicking on ACPI x64-based PC under the computer tab in device manager and tried to uninstall there but the option is there but not selectable.

My System SpecsSystem Spec
15 Apr 2010   #20
squall leonhart

Windows 7
 
 

ok update the driver for the computer type, it'll only have the same driver selectable but it should still redetect the system hardware state on the next boot.

I'm wondering if this could be because the boot manager has still got the processor count switch defined,

i wonder if vista boot pro or something similar would list the options currently used at startup.
My System SpecsSystem Spec
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 My computers only detects one Processor.




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