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Windows 7: New PSU-Won't boot

25 Mar 2011   #21
alphanumeric

Windows 10 Education 64 bit
 
 

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.


My System SpecsSystem Spec
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25 Mar 2011   #22
johnwillyums

Windows 7 Home Premium 64 bit
 
 

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.


Attached Thumbnails
New PSU-Won't boot-p1020122.jpg   New PSU-Won't boot-p1020123.jpg   New PSU-Won't boot-p1020124.jpg   New PSU-Won't boot-p1020125.jpg  
My System SpecsSystem Spec
25 Mar 2011   #23
Dwarf

Windows 8.1 Pro RTM x64
 
 

Hi John,

New PSU-Won't boot-p1020123.jpg

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.


My System SpecsSystem Spec
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25 Mar 2011   #24
johnwillyums

Windows 7 Home Premium 64 bit
 
 

Right. Got it. I'll try that. Very awkward to get those 2 plugs in, Thanks. Back in a minute
My System SpecsSystem Spec
25 Mar 2011   #25
johnnya

Windows Home Premium 64bit
 
 

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.
My System SpecsSystem Spec
25 Mar 2011   #26
Dwarf

Windows 8.1 Pro RTM x64
 
 

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.
My System SpecsSystem Spec
25 Mar 2011   #27
johnwillyums

Windows 7 Home Premium 64 bit
 
 

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?
My System SpecsSystem Spec
25 Mar 2011   #28
johnwillyums

Windows 7 Home Premium 64 bit
 
 

Mobo manual say "turn on L2 cache". Anyone know how to do that?
My System SpecsSystem Spec
25 Mar 2011   #29
Dwarf

Windows 8.1 Pro RTM x64
 
 

I'll have a look, but I don't rate the Gigabyte website for its ease of use.
My System SpecsSystem Spec
25 Mar 2011   #30
johnnya

Windows Home Premium 64bit
 
 

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...
My System SpecsSystem Spec
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 New PSU-Won't boot




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