I just recently changed my CPU from an Athlon XP2500+ to an Athlon XP3000+. After getting it all back together the computer would not start. I push power on, the power light comes on for a second or two and then shuts off. I put the 2500+ back in and all works fine. Motherboard is a Gigabyte 7VT600-RZ. Running 1GB PC 3200 DDR memory. Windows XP Service Pack 2. Any ideas?