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Steven James
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Replaced motherboard; says unsupported CPU

I have an HP Pavilion desktop with this Pegatron Socket AM2 motherboard. Computer wouldn't boot one day, and troubleshooting led me to believe that it was a bad SATA controller - a common problem with this type of machine/motherboard.

I found the exact same (refurbished) motherboard on eBay and swapped it in, but now when I try to boot it says "Unsupported CPU installed." So now I can't even get into the BIOS. I'm at a loss for why the same processor in the same motherboard type would have a problem. Any ideas?

This is my main computer - life is at a standstill. Please help! Thanks.
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dbrunton

8/22/2022 - Mon
Neil Russell

On the motherboard itself have you verified that the board is the exact same model and revisions?
Is it the M2N68-LA, M2N67-LA ? Can you tell us exactly what is on BOTH boards?
dbrunton

Well, first get the correct link.  Your link isn't going anyway.

>>  I'm at a loss for why the same processor in the same motherboard type would have a problem. Any ideas?

BIOS Revision.  Quite possibly the board you bought works for early versions of your processor.  With a BIOS update it works with your processor.  However you need the early processor for the update to be possible.

However we can't verify this at this stage until you provide the correct link to your motherboard so we can see the information for it.
Steven James

ASKER
Not sure what happened with the link - sorry:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01421635&cc=us&dlc=en&lc=en

Both boards say Pegatron M2N78-LA, rev 3.02.
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Neil Russell

What CPU are you using?
Neil Russell

Do you know if it is a "Violet" "Viola" or a "Violet3" board? There will be  a sticker on the board somewhere. And are they both the same?
Steven James

ASKER
I believe it's the Athlon 64 X2 - but of course, there's no way of checking ATM...
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Neil Russell

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dbrunton

More checking required.  What colour are your boards?

Your link shows an orange board.  That is an ASUS board.

This link http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01635734&tmp_track_link=ot_recdoc/c01421635/en_us/c01635734/loc:1&cc=us&dlc=en&lc=en#N61 shows a green board which is a Pegatron board.

And what model Pavilion is this?
Neil Russell

I believe that what you have is the Viola-GL8E and that is the AM2+ Socket whereas your old board was probably a Violet-GL8E and that was an AM2 socket.
Steven James

ASKER
Can't find any indication of the GL8E flavor on either board. Both sockets look identical - they're labeled Socket AM2, and have the markings "Foxconn(?)" T2, LF.

Neilsr, would a Socket AM2+ socket say only AM2?

Thanks for bearing with me on the details - I had no idea there were three mobos that are so similar.
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Steven James

ASKER
Not to say it's definitely correct, but the listing for the mobo I bought says:
Pegatron M2N78-LA Motherboard HP Violet-GL8E GeForce 9100 skt AM2+ AM2 DDR2

I would have guessed it to be compatible with any AM2 or AM2+ processor?
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Steven James

ASKER
Checking battery position vs. these two options, both of my boards appear to be violet. And (ironically) they're both green.
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dbrunton

Pavlion desktop model please.

You'll have to identify the processor.  Does the heatsink remove easily?  If it does then get the codes off the top of the processor and do a Google search on them.
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Steven James

ASKER
MASQ, you're onto something - the first difference I've spotted in these two boards, anyway. Looking at the P/N stickers, they're the same part# 513430-002, but the old board is a "rev:c02" and the new board is a "rev:c01."

Still, the link/post points out "The "Violet" version of this motherboard has several different part numbers. It also was originally designed for AM2/AM2+ CPUs, however in later revisions and/or BIOS versions support for some AM3 CPUs appears to have been added." If that's true, that the original boards should support AM2 and AM2+...shouldn't it still be compatible?
Steven James

ASKER
Ugh, I see...it's the power draw. Bummer.
Neil Russell

So like i said, unfortunately you dont have the same board :(
The subtle changes between boards are sometimes hard to spot but can be a show stopper!
Back on ebay it goes I guess?
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Steven James

ASKER
You guys were all super helpful. Thanks so much for steering me towards the answer.
Steven James

ASKER
That was a hard one to spot. The help & answers were superb, despite the disappointing result. Yes...back on eBay it goes. Thanks all!
dbrunton

It may be the power draw or not.

Your newer board is an older version of your original board.  It just doesn't support a newer processor.  Again this could be power draw or not.

You could buy a processor that supports this board.

And I suggest finish identifying your processor.
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