I have a home built PC that uses a EPOX 4PDA5 motherboard. When I turn on the computer after having been off for a while, it starts to post then stops. I then turn it off and back on. It starts to post then stops at a different point during the posting process. I have to do this at least 15 or 20 times before it goes through the complete posting process and then starts the operating system, which is Windows Vista. Once the computer is up and running, it stays running even if it goes through a restart after a software update. This problem has been a part of this computer for several years, even when it had Windows XP as an operating system. I have checked my ram sticks and also changed the bios battery. The PC is using a 430 watt power supply. The most the PC draws at any time is 250 watts. I'm at wits end over this problem and am hoping that some of you experts will be able to asist me in resolving this issue.