I have a Barco 708. I haven't fired it up for 2-3 weeks. Last night I started to tinker with geometry when I noticed a weird static / clicking sound coming from somewhere behind the blue tube. I then noticed that the rasters on all 3 tubes were starting to shake and "pulsate" in sync with this noise. It's not loud but it sounds like a mini Tesla experiment (scary). I thought maybe the recent cold temperature might be to blame, so I let it run for a few minutes. No change. I rebooted and got these weird white flashing film-like blotches during startup (no burn, luckily) and the clicking / pulsating continued. I'm worried something's going to blow up if I keep screwing around, so I thought I'd see what you guys thought.
What could be happening and what should I do? Never had a problem with this PJ before, something like 5000 hours on it. I made sure the raster is away from the edge of the tube faces, but it doesn't seem to matter. I'm not very technically savvy but I would like to see if I can diagnose this. Thanks!