Cpu red light pls help me

So I installed a new gpu(r9 390) on my pc a few days ago ( my old gpu was a gtx 760), then I connected the 6+8 cables from my PSU (cx600m), closed the case and started my computer.
But I noticed something different, a red light was appearing (under the CPU stock cooler box that comes with the Intel processors), I got worried cuz I knew that wasn't normal and the light was blue when I had my old system.
But even with the red light always on, no blinking, the computer seems to work fine. I tested it in games and didn't seem to have any problem, I even overclocked the r9 390 and the pc worked fine but the red light was always on.
I thought it could be from my PSU (cx600m) not handling the new gpu so I replaced the old gtx760 but this time the CPU cooler box was red not blue like it was before.
My doubt is: should I get worried about this red light? I searched for this on Google and it seems that when this light appears the pc won't boot, but mine seems to work fine even with the red light.
Is it normal?

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Clarification Request
(NT) Tell more. Motherboard model? Links?
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My motherboard is an Asus p8hm-61
I got 8Gb ram (4x2) ddr3/1600mhz
CPU is i5 3450 not overclocked

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No link? I'll read the manual on this board.
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There's some standby power LED

But it does not seem to indicate errors.

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Sorry for the no link its because I'm on mobile and the phone isn't very good so its hard to me :/

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Nothng in the manual tells me the LED indicates an error.

As to the color change, I re-read your top post. If you change machines, LED colors do change. Is that the issue?

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No if I change to my old gpu the red light on CPU fan stays red, but it was usually blue.
The color changed since I installed the r9 390 on my pc, when I booted my pc the color was already red. But I don't seem to have problems.s on the performance

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Link please.

Tell me exactly what has the red led. LINK PLEASE TO THE MANUAL FOR THAT PART.

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The red lighy is inside the Intel cooler box under the fan, so I don't think the problem is the motherboard.
It was blue now it's red all the time( no blink or beeps)

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I found a red LED

And the manual did not indicate it's an error sign. As to blue, what part had blue?

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The CPU cooler box light was blue, now it's rrd

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Link please.

Still need a product manual to see what's up.

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