I have a D975XBX2 with a Core 2 Duo E6600, 2GB of memory 800MHz and a 8600GT XFX. The computer worked very fine for 6 months or more then suddenly it started to doesn´t turn it on when I want. In the morning It doesn´t work anymore. In the afternoon always work. And in the night sometimes works, sometimes doesn´t. I noticed that the clock is always getting late, it doesn´t reset but always is one day late. I tested with another stabilizer and tension where I live is perfect. Please somebody give me a light of what could it be. I already changed the battery, this motherboard need a special one? I am with this problem for a month and I didn´t discovered what could be. Sorry about my english mistakes but I´m from brazil, so I don´t speak very well.