NO OS stated, Blues screens you mean the BSOD with the halt? statement on screen? i bet yes. (with words on blue screen)
Bought new memory or old?
no, (to supposed) yes, to , back to beginning done wrong or luck bad.
so put back the old RAM, does that work.?
or use just 1 stick of old ram. ? 1 by 1.
then repeat, new ram 1by1,
see? one stick is bad, if it all ran perfectly before you touched ram.
buying RAM for such and old PC is not easy.
first ASK HP, you asked now at yahoo, why here, and not HP>?
but HP long long ago retired the A series.
per HP pages. here
personally I do go the used PC store and buy $20 PC vastly newer.
sure would, but lets follow the rules for yours, step by step
step 2, (1 was hp , no support)
next is to lean what Memory was uses and what the processor spec is on the same,
the mobo is 2005 era. (as old as) 12 years ago...
its not Intel, its Athlon 64 (S) 3800+ 2.4 GHz
if it was intel , the intel chip drives the memory with its MMC
ASUS made this mobo by HP contract.A8AE-LE
hp name is: AmberineM-GL6E
4 GB* (4 x 1 GB) requires the replacement of the installed 512 MB DIMMs
PC-3200 MB/sec , speed ( not slower !) faster ok.
184 pin, DDR SDRAM
Dual-channel memory architecture
4 x 184-pin DDR DIMM sockets support unbuffered non-ECC 4 GB 400/300 MHZ DDR memory modules
page 7 is sparse in your manual.
the Athalon 64 has an ON DIE mmc, memory controller
this sets the base limits of all possible memory.
the memory speed is not by FSB, speeds
simpler terms, the memory is always running at a set fraction of the CPU speed
this chip has the advantage for running , cleaner DDR signals.
that other FSB designs.
what that means , to the user more memory choices.
I see this maker selling memory , a top maker,
test the sticks all 1 by 1,,, one good way to test it is run fast games.
DDR stick density rules and numbers and types of memory pre stick and pre side can cause problems on old processors.
I could not find the Athalon 64 rules on this, AMD can tell you at there site but im too lazy to look it up..
best is to let Crucial or Kingston guy you , here. for SURE>