Weird power supply problem

Biostar A780l micro atx amd motherboard
February 17, 2011 at 18:39:41
Specs: Windows XP, AMD Phenom X4 / 4GB
I've got a weird one. I built my new computer with a Biostar A780L. All went well. It was installed in a Power Up case w/ 450 W power supply. Shortly after building, the computer would not come on. Pushing the power button would light the system fan leds up for a second and nothing else. I thought it might be a problem with the case power button so I bought a new cool box and hooked it up in that case. Same problem.
So I bought a new Diablotek 500W supply. Hooked it up, same problem.
Here's where it gets weird. I hooked an old 250W power up that only has 20 pin, not 24. Works great. I'm online typing this post on the same computer that won't run on 500W new supply.
No hardware issues. Printers work, usb hookups work, video card, dvd rom, everything works great on the old power supply. What the heck??

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February 17, 2011 at 19:27:29
"installed in a Power Up case w/ 450 W power supply"...."bought a new Diablotek 500W supply"...."What the heck??"

You simply have poor taste in power supplies. It's not necessarily about the wattage, it's about the amperage & the quality of the components used within the unit. You couldn't pay me to use a Diablotek PSU. Read this JonnyGuru review/conclusion of the 1050W unit:

As for the 20-pin vs 24-pin plug, are you running a PCIe x16 video card? The extra 4-pins supply power to the PCIe x16 slot. If you're not running a card, the extra 4-pins aren't absolutely necessary but I highly suggest you get a decent power supply before you fry your entire system.

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February 17, 2011 at 19:58:51
Even weirder. When running in safe mode, the computer runs fine.

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February 17, 2011 at 20:17:51
Well, I've had a power up case/supply on my older computer for 5 years and it worked great. Still does. When I thought I needed a new power supply, I picked the Diablotek because it had such good reviews on Tiger Direct, NewEgg, and Amazon.
And besides the old power up 250 watt works on the new computer.
I do have a PCIe Video Card and it works fine with only the 20 pin on the old 250 watt hooked up.

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