TPU Red Light on ASUS M5A99X EVO AM3+ AMD 990X SATA 6Gb/s USB 3.0 ATX

Self-build, Posts everytime I turn it on, I've run it in Bios for a total of 12 hours (still waiting on OS install) with zero issues, mobo green light is on whether powered on or off (but obviously still connected to AC power), in Bios everything is perfect (temps, etc), all settings are default (no OC'ing, etc)...

any ideas why the red led light is on (always is on except when the rig is powered down)?

Could I have flipped a switch or something else whilst building/or something was toggled on during manufacture?

Thanks in advance!!
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More about light asus m5a99x 990x sata
  1. Page 2-17 of your mobo manual addresses that with; "The TPU LED (O2LED2) near the TPU switch lights when the TPU switch is turned to ENABLE..." so flipping that switch will make the light go out.
    I have not heard of any issues using the TPU function so I would keep it enabled personally
  2. Thank you for the succinct answer, appreciate it!
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