Problem with new computer power supply?

Microsoft Windows 7 home premium 32-bit
January 25, 2011 at 04:49:18
Specs: Windows 7 Home Premium
I recently purchased a new power supply for my computer. It is a Xilence XP480. My current power supply is rated at 400W while the new one is 480W. The supply has all the correct connectors for my computer.

After installing the new power supply, I decided to start the computer without the hard disk, floppy disk or DVD drive connected, just in case the power supply was faulty and damaged them. On starting the computer, it would not go to the POST screen so I could not access the BIOS either. There was just a series of continuous beeps. Looking up the motherboard manual, the beeps meant a memory problem. I have had these beeps before but everything was working in the computer before I changed the supply.

Now I switched back to my old power supply, leaving the hard disk, floppy disk and DVD drive disconnected. The computer started fine that time, going to the POST screen and allowing access to the BIOS, even without the disks connected.

Is it possible that the new power supply requires a hard disk, floppy disk or DVD drive to be connected before the computer will POST and start properly – are there some makes of power supply which do this? Or does it just sound like the new power supply is faulty? The fan in the supply was going and some power was definitely getting through. I don’t really want to connect a disk in case the supply is faulty and the disk is then damaged. What do you think?

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January 25, 2011 at 05:06:53
According to the specs, it's not a real good psu. It has two 12 volt rails and a 75% efficiency rating. If you're going to replace it, look for a psu like the Corsair line that has a single 12 volt rail. Since you got memory errors, download and run a test using a program called Memtest.

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January 25, 2011 at 05:44:33
Why did you replace the power supply in the 1st place? You should have done some research in advance. You bought a cheapie with bad reviews.

"The XP480 couldn't manage 100 per cent load and shut down straight away. It's inexpensive and quiet, but it can't deliver its claimed wattage and its voltage is unstable."

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