i have a HP Pavilion a820n it came with 512mb of ram and Windows XP. Now the problem. I bought 2x 1gb sticks and i cant get it to work with both sticks. It works fine with 1 stick and it works fine with the 512 but not with both 2gb sticks or any combination of the 1gb and the 2x 256mb sticks. If i use more than 1 of the 1gig sticks it will work great for a while. Sometimes a few hours sometimes a few minutes but eventually it will lock up. The 1 gig sticks are the same brand style ect. Shouldnt i be able to use both? According to crucial i should be able to use 4 gigs?? I have tried putting the i gig in the slots together also i have tried using both the blues ( 1 & 3 ) That way it wont even start. With one in the first 2 it starts but then locks up. The brand is Super-Talent There is a model number of D32PB1GN on them It also says PC3200 I dont know how to check to see if this is the right ram for sure but the people i bought it from says it is?? Is there any setting or something i am doing wrong? PS i have tried reseating several times, its not that. Thanks in advance.