This sounds to me like a heat problem. On my Radeon 9800, the fan died. The computer would run at "idle" with no problem, but would lock up when I tried to do anything taxing on the video card. Keep this in mind when trying to troubleshoot your problem. Tony Mayer >I need some suggestions on testing RAM. My computer sometimes locks up where >there is no response and even the mouse does not respond. The only solution >is to press the reset button. Details of the machine: > >Intel D845PEBT2 motherboard >2.4G P4 CPU with no overclocking >1 stick Samsung 512M RAM >1 stick of generic 1G RAM >Running XP Pro SP2 with all latest patches. This is a new clean install less >than a month old. > >I am suspecting that RAM may be the problem. RAM testing software, however, >shows no problems. The lockup happens almost on a daily basis, and often >occurs when accessing a web page using Firefox or IE. Latest lockup happened >with some video authoring software, however. I suspect that I will need to >replace the RAM to see if it is the problem. My post is to request >suggestions of other paths I can take. Thank you. > > >Peter > >[log in to unmask] > > Do you want to signoff PCBUILD or just change to > Digest mode - visit our web site: > http://freepctech.com/pcbuild.shtml Do you want to signoff PCBUILD or just change to Digest mode - visit our web site: http://freepctech.com/pcbuild.shtml