Ideacentre 310s - Won't POST with Bay Assembly closed

[Rigo]

Customer brought it in as it wouldn't POST.
I assessed it a mobo fault and referred it to Lenovo support and they agreed to repair it under warranty at 18 month. They had it for about a month and I just got it back.
To restore the customer's data I had backed up prior to shipping the machine I removed the HDD and slave it to my PC for efficient transfer (this Ideacentre is unbelievably slow even though the guy bumped up the RAM to 24GB).
After putting everything back together the thing won't POST. Power light comes on but nothing moves, no fan spin, can't force shutdown holding power button in .
After fiddling some, and some more, found out that if I left the panel holding the HDD and DVD fully open, NO PROBLEMS. When running like that, as soon as I tried to close it, the machine would die.
The thing's got no limit switch as far I could check that may be controlling that. Nothing in the BIOS either. Left it open and was able to run MemTest and HDD diag, no issue found. It's just no POST with the front closed.
It feels like something is shorting to kill/lock it but all screws are tight, no visible damage on any wire, I've dusted off the case squeaky clean...
Any idea what I might be missing folks?
Thanks for any help.
Rigo

 

[HCHTech]

It sounds like some bit of the case is getting torqued and causing a short when you tighten the drive cage. Here is a YT video of a no-power situation for that model, they found a bad component on the MB and just removed it - haha. It's a $400 pc, probably not the best construction.

 

[Rigo]

YT video

I felt tired watching him mess around to fix this cheap rubbish with an expensive setup. How much is he going to charge for the job?
some bit of the case is getting torqued and causing a short when you tighten the drive cage ~ quite possibly torqued as you say, it sure doesn't just get in requiring some serious pushing and wiggling.
In my case the power on light does turn on, but will only POST with the bay assembly open. Will again and see if I can close it more uniformly.

 

[Stever]

A fiber washer is the fix here in the right place, something is being pulled out of (or into) contact by the screw.

 

[Rigo]

Fix!
Wasn't torqued case nor fiber washer (though I did add some to all the motherboards screws).
When putting it back together I noticed two wires from the power cable to the HDD had been squished between the bay assembly and the case with wire showing through the sheath. Electrician tape around those, when closing the bay ensure they are all clear and problem solved.
Unbelievably stupid setup

 

[nlinecomputers]

Fix!
Wasn't torqued case nor fiber washer (though I did add some to all the motherboards screws).
When putting it back together I noticed two wires from the power cable to the HDD had been squished between the bay assembly and the case with wire showing through the sheath. Electrician tape around those, when closing the bay ensure they are all clear and problem solved.
Unbelievably stupid setup

Most such chassis have a channel/groove/conduit/clips that you are supposed to run the cable within to avoid being pinched. The problem is seeing it. If the repair center failed to do so it can be hard to identify.