Front Power LED always ON

[tripmusic]

I have a 2009 cMP, flashed to 5,1 with Hex CPU. Recently I've noticed the power LED on the front always stays lit, even when shutdown. I've reset the SMC and diagnostic LED's are green. I'm in a european country using 240V. My temps seem to be OK, though recently I noticed the CPU went up to 70C at idle. Could've been an mds process running, haven't noticed a problem since. Any ideas what would cause this?

Also, I recently took my fans out to clean and I had an issue with the rear fan socket on the MoBo. The plastic piece which the fan cable plugs into is loose and can prevent from making connection. I had to push it up to get the fan to work, but I think it keeps sliding down. What can I do to fix that?

EDIT: When it is shutdown and the power light is ON, if I take the CPU tray out the light turns OFF. Very weird.

 

[ActionableMango]

If it's pulsing, you are actually in sleep mode, not powered off.
If it's flashing, there is a problem.
If it's solid on, it sounds like your computer didn't complete the shutdown process, so it only looks like it's off.

 

[tripmusic]

If it's pulsing, you are actually in sleep mode, not powered off.
If it's flashing, there is a problem.
If it's solid on, it sounds like your computer didn't complete the shutdown process, so it only looks like it's off.

It's solid ON after shutting down and when I press it, it boots up. Also, forgot to mention this... When it's shutdown, if I take the CPU tray out the power light goes off.

 

[ActionableMango]

It's solid ON after shutting down and when I press it, it boots up. Also, forgot to mention this... When it's shutdown, if I take the CPU tray out the power light goes off.

Well as long as its working okay I guess I wouldn't worry too much about it.

However, you definitely shouldn't be disassembling your computer with the power still attached. You are asking for trouble by doing that.

 

[tripmusic]

Well as long as its working okay I guess I wouldn't worry too much about it.

However, you definitely shouldn't be disassembling your computer with the power still attached. You are asking for trouble by doing that.

Well it's not the correct behavior and I'd like to correct what's causing it to make sure it's not a sign of something about to fail.

I always discharge static electricity before working on my Macs. I wanted to check the diagnostics and used a non-conductive probe. Obviously, if I'm going to be disconnecting things inside It will be unplugged.

To me, something on the CPU board is causing this. The heatsinks are properly tightened.