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Faulty dual core processor? XP will only install with ACPI Uniprocessor HAL

I just picked up a HP DV6812NR notebook. It has a AMD Turion 64 X2 processor (TL-60, 2.0GHZ). It's a barely used refurb model that the guy was selling because he couldn't get the OS to install. I bought it off him cheaply hoping it was just a software issue.

This model has an IDE hard drive so there was no need to slipstream SATA drivers into my XP install CD. However the XP install would not work right away. It successfully formatted the partition and copied files, but would hang after the installation reboot.

After a bit of research I tried selecting a different HAL by pressing F5 as the XP setup loaded. Funnily enough if i selected ACPI uniprocessor PC, the installation did complete. However unsurprisingly, XP then only saw one processor in task manager, and performance seemed just a little funky.

Does this suggest a bad processor? If so that wouldn't be the end of the world as I could probably pick up another TL-60 for around $100. Even cheaper I could pick up a Turion 64 X2 TL-50 (1.6 GHz). Any reason that lesser processor wouldn't work in this machine? What would the performance hit be like if this notebook is to be primarily used for watching movies and surfing the net?


Thanks so much if anyone can advise me on this!
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kianog
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kianog
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Jaymz_RCommented:
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kianogAuthor Commented:
Of course I installed the chipset drivers for amd. I don't think the PowerNow would make any difference (in any case it doesn't seem to apply to my processor)

The problem is that XP will only install if ACPI Uniprocessor PC is selected as HAL during XP setup. I think this may signify a bad processor - is it possible for one of the 2 "cores" not to be function correctly?

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kianogAuthor Commented:
After a bit more research I'm realizing that changing the processor on these things might be rather tricky...from the probs I've described do you think it's definitely an issue with the processor, or could it be something else?
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nobusCommented:
check if the cpu is recognised correct in the bios.
if not, try another cpu - if possible
for most laptops, you can find disassembly procedures, though it takes a lot of work to replace a cpu
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kianogAuthor Commented:
Thanks for the suggestion.

The CPU seems to be recognized correctly in the Bios. It says Processor: AMD Turion 64 X2 TL-60.

However, just because it shows up correctly in the Bios doesn't rule out the possibility of it being faulty does it? Have you ever heard of a dual core working as a uniprocessor but not as a mulitprocessor like it's meant to?

If not the processor any idea what else it could be? I have run the BIOS memory check and checked the HD and both passed...
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PUNKYCommented:
Are you using Xp with service pack 2 installation CD? If you have Vista, try it see if it appears same issue?
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kianogAuthor Commented:
I did try the Vista CD it came with...same story I'm afraid :(
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kianogAuthor Commented:
and yes, it's an SP2 XP disc I'm using.
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PUNKYCommented:
Check in bios the hyperthread settings:
http://support.microsoft.com/kb/811366  
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kianogAuthor Commented:
There is no hyperthreading option in the Bios. I thought hyperthreading was only for single core processors anyway...
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PUNKYCommented:
I think previous owner has flashed bios .... did you check the bios version in HP support website?
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kianogAuthor Commented:
Yeah, i already reflashed the bios to the latest version from HP website...
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nobusCommented:
>>  However, just because it shows up correctly in the Bios doesn't rule out the possibility of it being faulty does it?    <<   i have to agree with you; always possible
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kianogAuthor Commented:
Thanks...any idea how i can try to diagnose this further?
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nobusCommented:
you can try some diags; best download ubcd  : http://www.ultimatebootcd.com/
and run some doag tools like cpu-z
siw can give info too http://www.lemonfiles.com/details.php?progid=9016      
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kianogAuthor Commented:
Thanks for rthe tips...I ran CPU stress test from UBCD and got message : "idle sync timeout:  IO-APIC + timer doesn't work "

Any idea what this suggests?
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nobusCommented:
no- you should look into the help files (if there are) of the diag.
but i fear there is not much to be found :  http://users.bigpond.net.au/CPUburn/
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nobusCommented:
my best guess is a bad cpu, or mobo; but without feedback , impossible to t ell
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