Question about System Power Supplies

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My computer ps is not providing power to the mother board or any of the periphals. It is a Bestec ps the led on the back of the supply flashes very slowly. Any suggestions before I go out and replace it?

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  • S_Nandha May 11, 2010

    does it flash when you plug it in to the computer?

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Disconnect the ATX main connector, bridge (with a wire clip) the green wire and any black (negative) wire, this should allow you to power up the PSU... now take a digital multimeter and measure the voltages on the 3.3v (orange), 5.0v (red) & 12v (yellow) lines, you will need to place the negative lead off the DMM on any black (negative) wire to achieve this...

If your PSU is off specification ie. more than 5% variance this IS your issue.

FWIW Don't waste your money on another Bestec PSU

Posted on Jan 25, 2009

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My Bestec ATX-300-Z cannot power up. When try to power it up after unplugging from wall outlet, it quickly show green led and the led goes off. I unplugged every connection to the computer, yet it cannot...


I may be wrong, but, seeing that it is only a 250watt power supply, its was probably cheap. NEVER buy cheap power supplies for PC's. Weak PS's can cause damage to multiple components on a computer.

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Bad Power Supply. Weak voltage power rail.

Bestec is a low quality power supply. Used to save the computer manufacturer money.

Also, a Power Supply with a weak voltage power rail will put out enough power to light LED lights, and perhaps spin fans, but not enough power to turn the Processor on, and/or keep it on.

A) ALL the LED lights use less than 1 Watt of power.

B) EACH fan uses 2 to 3 Watts

C) A typical Processor uses 51 to 125 Watts. Depends on what Processor it is.

Replace the Power Supply. Clean the inside of the computer out, with a can of compressed air for computers before installing.

What is the computer manufacturer name, and Model Number. The Model Number is on the back of a desktop computer tower next to the Windows product key, or up on the side of the computer tower.
Post back in a Comment.

Regards,
joecoolvette

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1 Answer

Power supply light flashing green ,,, tried unplugging mother board still flashes green is it the power supply or the mother board?


Most computer testing facilities will test your current power supply for free. A replacement is very inexpensive to replace. Bestbuy, MicroCenter, small computer shops and buy replacemnent from Amazon.com, newegg.com.. Just make sure you have the correct information for your replacement. The model number on the power supply would be your best bet in most cases. Good luck and have a great day. I buy power supplies as low as $15 dollars Generic

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Computer has bestec atx-300-12e power supply. it


Actually no, the power does continually comes in but, when stopped, the PS is in a state that could be assimilated to stand-by - only a small side circuit is continually operational.

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EMachine T6420 will only turn on to start the fans and then immediately turns back off - has Bestec ATX-300-12E power supply - do you think that's the problem


These computers have had problems with the mother board. I had one the same problem, and I did research on the INternet. Best advice.... find a replacement board which will fit this box. Then you will have to re-install the operating system with the cdrom. You may be able to repair the system.
More than likely the power supply is not the problem, but the board is suspect more than anything.

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3 Answers

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ok dandan, please tell me you live in nj. I am having the same problem with my puter and did every step you did what is up with this??

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I have already replaced mant Bestec ATX-250-12E power supplies because they have an internal failure. Consider yourself lucky if the thing doesn't power up your computer because it has a problem of imposing the +12 volt line onto the +5 Volt line then blowing out the mother board. Sometimes you aren't so lucky because once the damage is done then it is to late to just simply replace that piece of junk. I was lucky with my daughters E-Machine because if she tried pressing the start switch on the front of her computer it would sometimes come on and sometimes not. She just mentioned this to me and I immediately replaced that Bostec ATX-250-12E before it could do any damage to her computer. If anyone has an older E-Machine or an older Gateway machine then it would be a good idea to see if it uses that Bostec-ATX-250- 12E. If it does then go order another power supply, anything but a Bostec, and instead of a 250 watt order a 300 watt or better. I hope that this has helped those that might have this problem before it destroyes *********** boards. Marty

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1 Answer

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the mother board can have a short and the green light is on, replace the motherboard. when the power box goes bad, most of the time it shorts the mother board out, this has happened to me a few times. Farren

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