Where can I get a power supply? Original has been lost. It needs to be 4 pin 20 volt.
You need to find out first the PIN assignments (you have 4 pins) from the diagram of your unit. Try find a manual from the system manufacturer website. This way we can be able to understand which is the +/- (polarity) and requires the 20V input. Maybe you only need to tap from 2 wires in it, then the remaining wires can be just a signal or voltage sensing.
A variable power supply might be able to help and you can find it in Radioshack or similar electronic or DIY stores. These types of power supply only has "2-pins" however, but will allow you to select voltage and polarity for your needs.
SOURCE: replaced dead power supply computer still dead
hi
most power supplys are protected against faults when they are connected to damaged equipment
so it possibly just protecting its self
disconnect everything from the PSU except your MB
try to turn on
if your pc boots ok
re connect everythng else one thing at a time attempting to boot each time
when it wont boot you have found your fault
SOURCE: Not sure about updated power supply
Gee. If HP recomends you not to hook up the extra four pins it must be because the four either go nowhere,which may cause a short or ground condition.Or that the extra pins will power something that will then be in excess andd cause it too burn out. They know what will happen and for that rwason caution you not to do it. Of course it is you machine and if you have extra money to replace things with go ahead and do it if you really want to know that badly.
SOURCE: no power on dell e520 dimension
On the 20 pin connector, short the green wire to any black wire with a paperclip. This will force the power supply to turn on manually if the motherboard is not giving the correct "ON" signal.
SOURCE: Removed power cord from back of pc and after
Before calling it quits on the motherboard, try disconnecting ALL non-essential devices from the motherboard.
This includes drive cables, all slot mounted cards, etc.
Leave the processor and ram in place. Make sure ALL power cords from the power supply to the motherboard are properly plugged in. Some power supplies have 2 cords to the motherboard, a large plug and possibly a separate 4 pin that plugs in near the CPU. After checking your plugs, see if the board will power up. If so, you should get some beeps or status lights. If not, then it is likely the board has failed. Since you have replaced the original power supply, (assuming the replacement is compatible), it is not likely you have 2 bad power supplies.
If the board DOES power up, then plug in 1 internal device at a time to determine what might be "killing" the boot. A bad hard drive or DVD/CD drive can cause this as well as a shorted USB or firewire device.
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SOURCE: ISO 400 Power Supply 300W Description
Acquire a replacement power cable simialr to the one missplaced.
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