Memory upgrade not working. Windows XP restarts itself after about 3 minutes. BIOS update or is it screwed?

Hey all,
I have a cusotm build PC with an ASUS A7N266-VM motherboard and I just added some extra memory and its not working.
The manual says it can take 184 pinn DIMM DDR memory 256 and 512.
It already had 256 in it so i bought 512 to increase the memory alot.
I selected the memory using ORCA memory finder so it SHOULD be the right one.
When i installed the new memory the pc started fine first time. Then after about half an hour running it restarted itself.
It gave a system error in the event logs but no info on it.
Then after that it would only last about 3 minutes.
I removed the older memory and put in the 512 to see if there was a conflict but it was worse running on just the new memory!
The screen was all funny and it packed in pretty quick!!

i m not too good at this side of things but i reckon either:
a) i got the wrong memory from the memory finder website
b) the memory is faulty
c) the bios may need updating as its a new type of memory

Any ideas?
D

(by the way I bought: 512MB Module 184-Pin DDR DIMM PC2100 (266MHz) CL2.5)
CoreSupportAsked:
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phototropicCommented:
The RAM might just be bad.
Test it with memtest:

http://www.memtest86.com/

Run it for a few hours (overnight would be best).

Let us know how it turns out.
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simpswrCommented:
That board has 2 x 184-pin DIMM Sockets support max. 1.0GB  and uses PC2100/PC1600 non-ECC DDR SDRAM memory.

The non-ecc is important . . Is that what you have.?
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mjcoyneCommented:
If you leave the new memory out, and just run the old memory, is the system stable?

What brand of RAM is the new stuff?  What are the specs of the old RAM?  Have you tried clearing the CMOS (see the manual)?

What CPU do you have installed?

What is the configuration of the jumpers on BSEL1 and BSEL0 (on the backplane end of the AGP slot, on the CPU side)?  In the advanced menu of your BIOS, what do the "CPU/PCI Frequency (MHz)" and "CPU/Memory Frequency Ratio" settings read?

In the Advanced -> Chip Configuration portion of your BIOS, what is the "SDRAM Configuration" entry set to?
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nobusCommented:
does the memory conform with your manual, pg 13 : stating dimms with more than 18 chips are not supported
http://support.asus.com/download/download.aspx?model=A8N-SLI%20Premium
you can also check if the memory is compatible here : www.kingston.com
and is suggest NOT mixing brands; personally i always use kingston memory with Asus boards - it does NOT accept all brands
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CoreSupportAuthor Commented:
Hi All
thanks so much for the replys guys!! Im so stuck with this.

simpswr, I cant tell if its non-ecc, it doesnt mention it on the site though :(  heres the url:
http://www.orcalogic.co.uk/asp/prodtype.asp?prodtype=4419&ft=s&st=2
I ll check the manual tonight though and see what it says.

mjcoyne
If you leave the new memory out, and just run the old memory, is the system stable?
CS: yes its fine. Tried this last night.

What brand of RAM is the new stuff?  What are the specs of the old RAM?  
CS: Its ORCA. The old ram was elixir but the only info on it was 256 DDR Ram 266 MHz CL2.5 PC2100u-25330.
Have you tried clearing the CMOS (see the manual)?
CS: No. Will this help? I ll give it a go.

What CPU do you have installed?
CS: Its an AMD processor but i cant remember off hand what it is. I ll get the info later.

What is the configuration of the jumpers on BSEL1 and BSEL0 (on the backplane end of the AGP slot, on the CPU side)?  
In the advanced menu of your BIOS, what do the "CPU/PCI Frequency (MHz)" and "CPU/Memory Frequency Ratio" settings read?
In the Advanced -> Chip Configuration portion of your BIOS, what is the "SDRAM Configuration" entry set to?
CS: I'll check these 3 tonight and get the answers.

nobus :
Thanks for the info!
does the memory conform with your manual, pg 13 : stating dimms with more than 18 chips are not supported
CS: Yeah there are 9 chips on it i think but theres definitely not 18.
Just checked KIngstons website and they are coming up with that non-ecc type of ram that simpswr mentioned!!
It sounds like my one isnt that type.

If i need non-ecc and i havent got that i guess i ve got the wrong type then???
DOH!
i dont know if i can even return it....

I ll check the other things and see if it makes an impact.
Thanks!!
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nobusCommented:
the non ecc can be turned on/off in some bioses. look for it
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CoreSupportAuthor Commented:
cheers nobus. i'll give that a go.
I ve read the website where i bought the memory and they ha2 2 options for this type of memory.
option 1 was 184-Pin DDR DIMM PC2100
option 2 was 184-Pin DDR DIMM PC2100 ECC

I picker option 1 so i could have the non-ecc after all. I ll check my manual anyway!
thanks guys for all the help! will get this sorted!
:)
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CoreSupportAuthor Commented:
Hey guys
well been thinking it was dodgy memory right enough....phoned up the company and they said it sounds like its faulty aswell!
they ve sent me a replacement so heres hoping it works this time.
Thanks so much for all your help guys...I thought it was my pc.
Brilliant.
Dave
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