right, yes. cheers wannabe1 - great advice for new mobo route, which i didnt already know. very useful.
querryf - i havent run memtest yet - although i thought that if they (the RAM sticks) worked without sys hang by themselves then they would be ok. As soon as i put two in i get freeze - max 2 mins after sys tray icons load. However i am keen to double check anyway so i will run it.
I'll let you know the results as soon as i do.
About the power supply - i have read on other forums that this is often a source of probs - and from what i have read my symptoms do seem to fit. Always goes down when more power required. I have a stock (cheap) case supply 400W - but i read that wattage means nothing. So is there anyway i can test the efficiency of the psu? I have asus probe which has voltage readings, and speedfan - but im not sure what i'm looking for. Asus 'cool and quiet' also has a voltage meter.
would 1gb draw more power than 756? - because it did run, although unreliably, with 756. Its running fine with 512.
will look into memtest this weekend. Thanks for all the incredible support!
Edited by deudonne, 25 November 2005 - 07:45 PM.