My computers only detects one Processor.

[MichaelMarr]

The problem is that my computer is only detecting one processor when i have two I have a HP Pavillion s5306uk desktop computer and I am running windows seven x64.

I changed settings in MSConfig under the advanced boot menu to 2 processors at startup and now after a restart It is only detecting one.

I went into Device manager and there it is showing two installed CPU's but in task manager only one is shown again.

If anyone could help me fix it so it shows two again I would be appreciate it very much.

Thanks.

 

[whs]

Changing the setting in advanced boot is in vain. That setting is for H/W testing purposes only. How did you determine that only 1 core is being used ??

 

[MichaelMarr]

I know i shouldn't have done that I wanted to make the boot time faster so i googled ways to improve windows 7 performance and i read that doing it improves the loading time. I found it out that it is only showing one because I have a desktop gadget that shows the CPU usage and usually it has two displays and now it has only one, also in task manager under the performance tab before there was two sections to it where the screen was split in half showing each CPU and now it only shows one.

 

[CommonTater]

The problem is that my computer is only detecting one processor when i have two I have a HP Pavillion s5306uk desktop computer and I am running windows seven x64.

I changed settings in MSConfig under the advanced boot menu to 2 processors at startup and now after a restart It is only detecting one.

I went into Device manager and there it is showing two installed CPU's but in task manager only one is shown again.

If anyone could help me fix it so it shows two again I would be appreciate it very much.

Thanks.

Been in your BIOS lately?
I'm guessing that you have hyperthreading support disabled.

 

[whs]

Have a look at this. Maybe changing the BIOS setting will help: How to Activate a Dual Core Processor | eHow.com

 

[MichaelMarr]

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.

Have a look at this. Maybe changing the BIOS setting will help: How to Activate a Dual Core Processor | eHow.com

Thanks for getting this for me whs but I don't have an installation CD, I bought the PC from PC World and I didn't recieve one. And as for the BIOS as i mention above I am not familiar with any of it and don't want to go into it incase i cause any further unwanted damage, Sorry again if I am annoying you at all.

 

[squall leonhart]

Check the Computer item in device manager and post whether it says uniprocessor compatible acpi system or multiprocessor...etc

 

[Bill2]

Try forcing windows to redetect your dual core. See the tutorial below (its for vista but should work for win7 also). Its very simple.

Force Windows Vista to redetect your dual core CPU

Edit: Doesnt work with Win7 RTM

 

[squall leonhart]

is that a setting that only appears if you change the core count? because its not present on windows 7 for me :|

 

[Bill2]

leonhart is right. Detect HAL was there in the earlier builds but its gone from win7 RTM.

 

[squall leonhart]

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?

 

[CommonTater]

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?

 

[MichaelMarr]

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.

 

[MichaelMarr]

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.

 

[squall leonhart]

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.

 

[MichaelMarr]

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.

 

[squall leonhart]

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.

 

[not so gray matter]

Yeah the setting he's talking about is Task Manager > View > CPU History > One Graph for Each CPU.

 

[MichaelMarr]

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.

 

[squall leonhart]

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.