Installing memory is not over difficult providing you take care:
http://www.ehow.com/how_895_install-ram.html

240 pin, DDR2 SDRAM
pages 11 and 12
http://bizsupport.austin.hp.com/bc/d.../c00311110.pdf

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Hope this helps.

Gerry
~~~~
FCA
Stourport, England
Enquire, plan and execute
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Grumpy_45@msn.com wrote:
> I want to increase my memory to 1 gig. Is this something a
> inexperienced person can do? I have 256 in slot 1 and 256 in slot 3,
> is it as simple as removing those and replacing it with a 1 gig stick?
> Or is there more to installing ram? I can take it in and have it done
> for a $40 labor charge.
>
> HP Pavilion a1424n desk top
> pentium 4 160 gig HD
> xp home