Question Why will 3 different 650W psu's do not run my pc when a 400W one will

[GBB]

The PSU in my PC failed, I ordered a 650W gigabyte PSU and the PC would hang within 1 minute, I got a replacement Gigabyte PSU and the PC would not boot with this one.
I have now got a 650W Corsair PSU it runs for about 2 seconds and then cuts out.
Yet this PC will boot up and run on an old 400W PSU every time I fit it, and is doing so now.
What could be causing this problem?

 

[Lutfij]

When posting a thread of troubleshooting nature, it's customary to include your full system's specs. List them like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:

Just to understand if you're really going to need 400W of power. You also forgot to mention the models for the three units listed above. There are series within each company portfolio to meet a price point and the lowest price point often have the bad units.

 

[jonnyguru]

Without knowing any of your other components, nobody can say.

 

[GBB]

CPU AMD Vishera FX-6 Core 6300 3.50Ghz (4.1Ghz Turbo)
Motherboard ASUS M5A78L-M/USB3 Featuring AMD 760 Chipset

1st PSU Gigabyte P650B-UK
2nd PSU as above
3rd PSU Corsair VS650

Ram 8GB DDR3 1600Mhz - CRUCIAL Ballistix
Hdd 1TB SEAGATE SATA3 - 6Gb/s, 7200 RPM & 64MB Cache
GPU on board
SAMSUNG 24X DVD+/-RW Dual Layer & Dual Format
Palicomp low end gaming PC

PC runs on an Aopen Z400-08FC
which has a 13A and a 10A 12V rail

 

[jonnyguru]

Latest BIOS?

(Revision 2101 is the latest... although it's four years old. That's a pretty old board.)