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My computer won´t post

Noofen
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I've got an old lga 775 mobo and i have used a new 700w psu with it and it won't post. It does post with my old 300w one (last time I checked) so, why doesn't it post? I'm thinking maybe the molex connector on the new one wasn't meant to be on the mobo? Can someone help?

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Is there a switch on the PSU anywhere? try flipping that.

"You think your Commodore 64 is really neato! What kind of chip you got in there a Dorito?" -Weird Al Yankovic, All about the pentiums

 

PC 1(Lenovo S400 laptop): 

CPU: i3-3217u

SSD: 120gb Super Cache mSATA SSD

HDD: Random seagate 5400rpm 500gb HDD

RAM: 8GB Crucial DDR3-SODIMM

OS: Windows 10 education

 

PC 2(2014 Mac Mini):

CPU: i5-4260u

HDD: 5400rpm 500gb

RAM: 4gb DDR3 (soldered on :( )

OS: MacOS Sierra/Windows 10 pro via bootcamp

 

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If there's no post it's either Mobo or PSU. Either could be dead, or one of the connectors might be unplugged. Since your mobo was working, I'd check connections, then if still no post it means your new PSU is DOA.

What's your new power supply? Just curious.

REMILIA Mk.IIIG CPU: Ryzen 7 5700X3D, Cooler: Gelid Sirocco (Arctic MX6), RAM: 4x 8Gb sticks of Patriot Viper Steel Series 3600 CL17, Mobo: AsRock X570 Taichi, GPU: Inno3D RTX 3080 iChill x4 10G, Storage: 1TB Intel 670p NVME SSD boot drive, a few 1TB and 512gb SATA/NVME SSDs for game storage, 6 hard drives:2-12 TB, PSU: Montech Century II 850W, Case: Silverstone FLP02, PCIE Cards: Cheap Chinese Marvell 88SE9215 4 port SATA card, Sonnet Allegro USB3.2 Card Monitors: ViewSonic Elite XG270QC (165hz, 1ms MPRT, 1440p, VA, Freesync PP, pneumatic stand), electriq 27qhd180i (IPS, 180hz, 1440p, 1Ms), iiyama G2530HSU-B (75Hz, Freesync, one in landscape, one in Portrait, all on pneumatic monitor stands).

 

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3 hours ago, ibabyslapper said:

If there's no post it's either Mobo or PSU. Either could be dead, or one of the connectors might be unplugged. Since your mobo was working, I'd check connections, then if still no post it means your new PSU is DOA.

What's your new power supply? Just curious.

It's from a Spanish brand called Tacens (yes, I am Spanish). They're a reliable brand. I'll check again with the 300w one and make sure It's not the mobo. Thanks.

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1 minute ago, Noofen said:

I'm dumb, but not that dumb ;)

I'm not saying that you are dumb. PSU switches are easy to miss. I looked up your PSU (Nice PSU BTW) and there is one. Make sure it is set to I. If it is or that doesn't work, try another wall cable. Maybe the cable doesn't work.

"You think your Commodore 64 is really neato! What kind of chip you got in there a Dorito?" -Weird Al Yankovic, All about the pentiums

 

PC 1(Lenovo S400 laptop): 

CPU: i3-3217u

SSD: 120gb Super Cache mSATA SSD

HDD: Random seagate 5400rpm 500gb HDD

RAM: 8GB Crucial DDR3-SODIMM

OS: Windows 10 education

 

PC 2(2014 Mac Mini):

CPU: i5-4260u

HDD: 5400rpm 500gb

RAM: 4gb DDR3 (soldered on :( )

OS: MacOS Sierra/Windows 10 pro via bootcamp

 

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On 31/1/2017 at 11:11 PM, AA-RonRosen said:

I'm not saying that you are dumb. PSU switches are easy to miss. I looked up your PSU (Nice PSU BTW) and there is one. Make sure it is set to I. If it is or that doesn't work, try another wall cable. Maybe the cable doesn't work.

Of course I already flipped the switch, but thanks anyway haha. I'll try another cable too, thats a good idea.

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1 hour ago, Noofen said:

Of course I already flipped the switch, but thanks anyway haha. I'll try another cable too, thats a good idea.

If you have another desktop lying around you can also try it on that one too. There is a chance you got a defective one. It happens all the time. You can send it back and get a new one. Whatever you do though, DO NOT TAKE IT APART. The internals of a PSU can kill you and if it comes to that, send it back and get another. It isn't worth dying.

"You think your Commodore 64 is really neato! What kind of chip you got in there a Dorito?" -Weird Al Yankovic, All about the pentiums

 

PC 1(Lenovo S400 laptop): 

CPU: i3-3217u

SSD: 120gb Super Cache mSATA SSD

HDD: Random seagate 5400rpm 500gb HDD

RAM: 8GB Crucial DDR3-SODIMM

OS: Windows 10 education

 

PC 2(2014 Mac Mini):

CPU: i5-4260u

HDD: 5400rpm 500gb

RAM: 4gb DDR3 (soldered on :( )

OS: MacOS Sierra/Windows 10 pro via bootcamp

 

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On ‎07‎/‎02‎/‎2017 at 2:21 PM, AA-RonRosen said:

If you have another desktop lying around you can also try it on that one too. There is a chance you got a defective one. It happens all the time. You can send it back and get a new one. Whatever you do though, DO NOT TAKE IT APART. The internals of a PSU can kill you and if it comes to that, send it back and get another. It isn't worth dying.

Ok, I'll try that, thanks

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