Hi, I bought 2 256MB DIMMS of PNY PC100 Memory and I put it in my computer and I go to boot it up and when it starts to load Win XP Pro it just completely reboots it self. I cant even get it in to safe mode. Right now i have one of the 256 dimms in there and a 128mb dimm which are both PNY and its running fine with 384MB. Can somone tell me what might be the problem is. I know this computer will support 512 of ram.