So something odd happened recently. One night I was awakened by my PC beeping randomly (sometimes a few every 10 seconds, then it might go away for awhile and come back). Because I heard the drives seeking right after, I thought the drives had a problem, but after removing the video card (HD 4830) and using the IGP, the beeping stopped.
Since I thought maybe the video card was dying, I removed it and put in an HD 5750 from another computer. The same beeping happened again. I had no idea what the issue might be, but I did notice the PCI-E plug was unseated about 1-2mm from the PSU (X-460 is modular). After reseating, I haven't heard the beeps for a day or so.
So, is this beeping the PSU or the video card (with two different video cards beeping!)? I can't see any sort of speaker coming from the video card, and it's not the motherboard because I didn't plug in the PC speaker (and don't think there's one built in because there is no POST beep unless I plug one in).
I googled about Seasonic PSUs beeping but it doesn't sound common, whereas it sounds common for video cards to beep, but in my case there was no obvious issues with crashing, overheating, etc.
Lone Industries L1: i7 3770, 2x4GB Mushkin Silverline, 160GB X25-M G2, Dell U2412M + U2211H
Lian-Li A04: i5 2400, 2x4GB Mushkin Silverline, 80GB X25-M G1, 9TB FlexRAID, 1GB 5750 (passive), all on Seasonic x460, hooked up to Sony 40" EX620 + KEF 2005.3 + Yamaha RX-V667