Hello, this is my first post. As the title says, my IIsi will not power up. Never happened before; this machine has been completely reliable. The only anomoly has been that on initial power up, the monitor would be black and white only. After power up is complete, doing a restart would fix that; the monitor would be then be in color. I replaced the monitor thinking that it was the cause, it was not. To try and fix the powerup issue, I replaced the Sony power supply with one I bought on ebay. Again, nothing. Even the fan does not spin. I had thought that at least the Apple monitor would power up as it is directly connected to the PSU, but no go. Ideas? Thanks in advance for any replies.