I am a college student with a limited budget so keep that in mind with your answers
I have the Pioneer VSX-D850S. It has performed like a champ for me, being hooked up to a Synergy 6 System (yay for mediocrity!). Recently, after the receiver has been on for 4 or 5 minutes, and has warmed up, a loud constant crackle will come through on every channel. The crackle is independent of the volume, in that, it is always very very loud. I looked inside (don't worry I am a pc tech with an A+ certification, so I know what and not to do) and it appears that the problem could be maybe the power supply, which appears from outside the unit to work, or it could be an internal fan that is mated next to a huge heatsink. The fan does not turn on at the unit's power up, and doesn't seem to kick on during use. Any recommendations, experience, or opinions? Kinda stumped on this one.