I recently built a new machine for the living room as a HTPC.
Everything works very well -- when it boots. But it always requires several attempts powering it on before it will "catch". On each attempt, I can hear the drive spinning up, but no cpu fan, no POST (not even any video signal at all), no beep, nothing. Just the drive spinning. After about the 5th or 6th try, I get the drive, the fans, POST, and everything is great.
After the system does boot, it works flawlessly all day (gaming, DVD's, music streamed via wireless from a different machine, large file transfers, etc, etc.) But the next time I want to startup, it requires several power attempts again.
Mainboard: ASUS K8N-E (nVidia nForce3 chipset)
CPU: AMD Athlon 64 3400+ Newcastle CPU
Memory: 1 GB (2x512) PC3200 (Crucial brand)
Video Card: AOpen (nVidia Geforce) 6600GT
connected to Sony HDTV via component connection.