New PSU-Won't boot

[alphanumeric]

If you have all the power cables correctly connected, and nothing is damaged, it should boot up using the power button on the motherboard. Even with all the case cables disconnected, it might even be worth trying it with the case power button, reset button, etc cables disconnected, just in case one is in fact shorted out. The polarity of the case reset and power cables doesn't matter, but the hard drive LED and power LED cables have to be on the right way or the indicators won't light up.

 

[johnwillyums]

Anak. I don't seem to have the second one down, the ATX 12 volt. That's why I'm using the one from my previous psu. (yellow in the pic)
This is all I have left from the Corsair stash. All the rest are SATA cables.
The one in the first pic seems to have the correct profiles to fit into the ATX 12 volt socket top left on the mobo but the plug is too long to fit in the socket as there is something protruding from the mobo directly under it. As the 4 bottom pins are empty I suppose I could cut them off to make it fit and that would leave me with 2 4 pin sockets to go into the psu. That doesn't feel right.
Also, there's no reason why the old one I'm using shouldn't work. It fits perfectly.
I'm still thinking it's the front panel header pins as I had trouble with these before.

 

[Dwarf]

Hi John,



This is the cable you need. I take it that you have tried to fit it with the single plug end to the motherboard? That end should go to the PSU and the twin plugs should go to the motherboard. The cable is designed so that the same adapter can be used for motherboards requiring a 4-pin or an 8-pin connector. Quite why the single connector has unused positions, I'm not sure.

 

[johnwillyums]

Right. Got it. I'll try that. Very awkward to get those 2 plugs in, Thanks. Back in a minute

 

[johnnya]

Good call Dwarf. That cable is exactly what he needs. Some motherboards only have 1- 4 pin connector, while his apparently has two - side by side. And yes they can be a tough fit. Have to be careful of other components near by.

 

[Dwarf]

I've had a look on the Corsair forums regarding this PSU, and there are a number of entries regarding this connector. To me, it is just poor design.

The Corsair Support Forums - Search Results

If the above link doesn't work, try The Corsair Support Forums - Search Forums and enter ax850 as the search term. Don't forget to verify the captcha image (refresh if necessary) and then click Search Now to continue.

 

[johnwillyums]

Dwarf! You magical man I now have power, fans etc. hooray. I'm getting somewhere but still no boot or display. The mobo is showing number 69 in LEDs
Any ideas on that?

 

[johnwillyums]

Mobo manual say "turn on L2 cache". Anyone know how to do that?

 

[Dwarf]

I'll have a look, but I don't rate the Gigabyte website for its ease of use.

 

[johnnya]

If you Google "Turn on L2 cashe" you will get many hits. The one below still refers to possible POWER issues. ??????? This is getting stranger by the minute.


"Turn on L2 Cache" isn't an instruction to you, or anything that's optional on the system; it means that the BIOS got to the stage in the start-up routine where it was commanding the CPU to activate it's secondary on-die memory cache; this command could simply be failing due to a bad CPU, or it might be hanging there due to insufficient power delivery. The first thing I would do is re-seat the CPU - it might just be a poor contact ball...

 

[johnwillyums]

Thanks. I've just googled it and it seems to be a common problem but I can't find an answer.

 

[johnwillyums]

Just swapped the ATX 12 volt to another socket on the PSU and now I have an 89 error on the mobo

 

[Dwarf]

I've found this link for the manual, and as you state the code 69h mentions Turn on L2 cache. I can't see where you can do this, the only thing I can suggest is to completely reset your BIOS by removing the battery as described below (from pg 38 of the manual):



Gigabyte GA-EX58-UD5 Motherboard Manual - iUserManual

Code 89h states 2 possible reasons, viz: Assign IRQs to PCI devices and/or Set up ACPI table at top of the memory.

I still think that you will be just as well resetting your BIOS to its defaults as I suggested above.

 

[Rhammstein]

As far as I know, it's not actually asking you to do anything, but this is as far as it got into post, which is usually not near the end of post.

I think dwarf is right on, myself I would remove the Cpu, then reset, double check all connections and make no assumptions, look at it all from a fresh perspective, it's easy to repeat mistakes.

 

[johnwillyums]

Yeah. I just swapped everything over on these 2 pcs and tried to boot and I got the 69 error again. I'll do as you suggest and reset the BIOS. Have to take out the GPU to get at it. What a pain.
Thanks to all of you for your help. I'll be back when I've tried that.

 

[johnwillyums]

Well. I took out the battery and thereby reset the CMOS. However I now get an 89 error and no boot or screen display. The LEDs at the top right are all lit. I think they are the phase LEDs and indicate CPU load. I also get 4 LEDs near the 24 pin ATX socket which I think are DDR load.

Any ideas?

 

[Rhammstein]

Well, if it were a contest and we were placing bets, I would bet on a bad Cpu, but that's just me.

Can you get a loaner Cpu to test with? I'm assuming you don't have a spare or you'd have mentioned it.

If not is there another computer you can throw the Cpu in to verify it works?

 

[johnwillyums]

Afraid not. It's an i7 920 and it's only just over a year old. Before changing the PSU it was working perfectly.

 

[FliGi7]

Afraid not. It's an i7 920 and it's only just over a year old. Before changing the PSU it was working perfectly.

You have no idea what the PSU might have fried when it failed. Like I said in my first post, it could have very well toasted a component or two on the motherboard, to include the CPU or anything else.

 

[johnnya]

John I am sorry you are still struggling with this issue.
FliGi7 is absolutely correct when he said that when the PS failed it
could have taken out the CPU or MB. That CPU, that MB and that PS are
quite pricy as those items go. Before even thinking about replacing
any of these, can you get your hands on (borrow, swap, beg) another
Plain Jane PS. As long as it has the newer 24 pin main connector
and two (2) of the 4 pin 5v connectors with it, it would be good enough
to test with. Let's get the possibility of a faulty new PS out of the way.