iMac Late 2015 Startup issue

[Dolencd]

Cheers!
I have a late 2015 iMac with some updated specs.
For the past 2 days I've had problems starting it up.
I try to start it up in the morning, nothing. Like it didn't have power. Not a sound, a click, nothing.
Then I remove the peripherals nothing.
I remove the power cable from power socket and iMac, nothing.
Then I leave it for 5 minutes. Nothing.
Then I turn it around and vacum the vents and it starts to work normally.
When It starts it works completely normally. It's weird. Really weird.

This Yesterday. Today, when I fiddled around with the vents it also didn't start, but when I removed the power cable for 5 minutes. It started normally. Is it possible that it's connected with updates?

Thanks for the help folks.

 

[James_C]

I notice that you have 32GB of RAM. Was this added when new by Apple or have you added RAM after ? It’s a long shot but I would remove any 3rd Party RAM and see if you have the same problem. I have the same iMac as you and mine is fine.

 

[Dolencd]

I notice that you have 32GB of RAM. Was this added when new by Apple or have you added RAM after ? It’s a long shot but I would remove any 3rd Party RAM and see if you have the same problem. I have the same iMac as you and mine is fine.

Huh! That could work. Would also explain that it starts to work fine when I remove the power supply for a few minutes.
The RAM is the same from the start though.

 

[James_C]

Or is could be one of the RAM modules is not in firmly and vacuuming moves it slightly, certainly sounds like a loose connection somewhere.

 

[Dolencd]

Yeah it does!

Or is could be one of the RAM modules is not in firmly and vacuuming moves it slightly, certainly sounds like a loose connection somewhere.

Yeah! A loose connection for sure! But wouldn't a problematic RAM at least start the computer and get stuck while booting? The weird no power thing bothers me.

 

[topcat001]

This sounds suspiciously like a bad power supply. If the RAM checks out, then that's the next thing to check.