Hiya folks, 1st post. I've read Tedster's excellent post, which to be honest most of went over my head but i'm sure i've broke a few of his rules, different speed/manufacturer of RAM. I'd love to RTFM, but the computer was built by a friend of a friend (not a con man). I checked with crucial to see what my motherboard could take, ordered compatible RAM and installed it taking as much care as possible. I've now downloaded and used SIW, but to be honest once again i'm lost. I purchased 1Gb PC3200 DDR to go with my 512Mb PC 2700 as I was told it wouldn't be a problem. But when I fitted it, it failed to register, and when I removed the original memory to allow the new memory to run on it's own the computer failed to boot. It had 1 long beep then a pause then the pattern continued. I took the memory and tried it at a friends, it worked but after his system booted up it became unstable and became prone to random reboots and freezes. I'm not sure what information I'd need to post for someone to be able to help me but i've decided to post screenshots of what SIW produced. Info for motherboard (Jetway 865GDMP): Info for Memory: If I can post anything else to help just let me know. Thanks for any help you can give.