Asus Z87-K Power LED, but No Boot / POST

[Mainstay]

I have had a perfectly working system with an Asus Z87-K MB, i7 4770 CPU, Corsair TX650M PS, and PNY GTX 750 Ti Graphics Card.

I replaced the GTX 750 Ti card with another GTX 750 Ti card from Asus. The new card had a 6 pin PCIE power input for additional stability when over-clocking.

Without the PCIE power, the Asus GPU has a red led.

When I connect the PCIE power, the Asus GPU has a green led.

However, the computer will not power on (let alone boot). No errors. Just dead.

Fine, pulled the Asus GPU and put the PNY card back in... except... system still won't power on. The MB has a green LED and the PS is 100% (tested multiple ways, and replaced with a Cooler Master, just to be sure).

I was careful when installing / removing, so I am 95% certain I didn't do anything ham fisted. I cannot find a ground fault (although I have not yet pulled the MB and tested on my wooden workbench).

There are no beep codes or errors indicated. Just no power, at all.

I would appreciate any input or comments.

 

[MDD1963]

Was the power supply actually physically switched off at the rear (equivalent: Power cord removed)

Or was it just shutdown for the GPU removal?

(Not to be insulting/implying, just looking for potential causes; certainly, swapping any cards with partial power at/in the mainboard is rarely optimal....)

All that is left is testing both GPUs in a known good rig...

Beyond that.....leaves the MB....unfortunately.

 

[gadgetfixup]

LOL, you know the drill, yank it all out, put just board, CPU, RAM and PS on bench, fire it up. If it doesn't work then grab a cheap 300W power supply and try that.

I had to look at your location twice as we just had one of these in the shop almost exact same specs with the same issue. The guy that brought it in ran a shop for years in our small town and said he built 100s of machines but this one has him stumped. Even tried several PS's was his story. No power.

Busted it all apart, grabbed my trusty old 250W power supply for testing and sure enough it pops right up. Plugged in his 750W modular supply, nothing. Looked at where he had the CPU (8plug) lead plugged in and noticed there were at least 4 other places it would fit. I tried plugging it into another socket, still nothing. Tried another socket and low and behold, up it came.

Fixed all his other assembly errors, put it back together and billed the invoice.

 

[gadgetfixup]

If you can't get it to come up on a cheap supply then get your magnifying glass and look closely at that PCI slot. Some PCI cards are square cut on the bottom and if you force them into the slot they'll catch a pin and roll it down into the slot. Look at all the square holes and make sure there is a gold wire in each of them. If one is missing, look at the slot and see if it rolled in

 

[Mainstay]

Was the power supply actually physically switched off at the rear

The physical switch was thrown to off and the power cord removed. Everything was done on a wooden bench.

I pulled the whole works out and did the drill:

put just board, CPU, RAM and PS on bench, fire it up

Still no go. Opened another brand new PS and tested. No go.

This is interesting:

Looked at where he had the CPU (8plug) lead plugged in and noticed there were at least 4 other places it would fit

but I am positive all was wired correctly.

get your magnifying glass and look closely at that PCI slot

Hmmmm... It could be. The board looked pristine... but yes, something like this would be tough to spot. I should say there was no 'forcing' of parts... everything went together smoothly.

The MB even had a second PCIe which also did not work (although if there was a ground fault on the first slot, this wouldn't make a difference).

I have RMA'd it and will see what the heck is going on.

I see online that this is not a well loved board. Many others with similar issues (which is true for any board if you search hard enough).

Not to be insulting/implying, just looking for potential causes

Absolutely! I take no offense... I am just as curious to find out what went wrong... I reviewed the install in my head asking exactly the same question... did I overlook something simple like inserting the card with power running? I don't think that is the case... but, maybe the board hadn't fully discharged all power? Not sure... if that is the case, then this board is way too sensitive for my likes.

 

[MDD1963]

Asus has taken a bit of heat for MBs going to 'an early grave' over the past few years.....although I think that applied to more recent socket 2011 offerings...

 

[discipulus]

Boss at my shop, when given a choice, always goes for gigabyte boards. He says asus boards all develop problems eventually. Especially with the dimm slots.