Replace power supply because it seemed faulty. But now it doesn't power up at all. Replace 300 watt with a 430 watt
Maybe the new Power Supply is bad. You did turn the O/I switch on the back of the Power Supply to I? O means off.
If it still does not work, try putting the old Power Supply back in just to see if it acts the same way. If so you have a motherboard issue. It's not uncommon on some computers that when the power supply goes bad, it takes the motherboard with it.
SOURCE: will a 512 mb video card work with a 300 watt power supply
It all depends. Does the card require a 6 pin PCI-E power connection? Does your power supply have such a connector? If both answers are yes then it is possible. If the card does not require a power connection then it is also possible. But I would recommend upgrading to at least a 450 watt psu to run it more efficiently. Hope this helps.
SOURCE: Dell Power Supply replacement
You can replace it with a 500 watt if you want to. 300 watt is a good watt. But if I could make a recommendation I would say go to the 450 just incase you ever want to upgrade your video card or anything like that. IF this helped please rate
SOURCE: wont boot/start
Turn off power, unplug, hold power button for 30 seconds, take out memory, or if you have more than one stick only take all but 1, plug the power back in and start the computer. If a screen pops up that bios has changed press F2 to continue once computer is completly loaded click start, shut sown, unplug power cord again, hold power button 30 seconds, insert other memory and restart
SOURCE: on my desktop witch has a asus P5DV-VM SE
430 watts should do it..strip it down to the very minimal you need to start it. Also make sure the processor is seated correctly and that you have used thermal paste.
http://www.aa1consulting.com
SOURCE: I there a replacement for a gx280 SFF powersupply?
This model uses a custom dell power supply, and is made to be low cost. So the simple answer is no. You can use a different, higher watt power supply but it wouldn't fit in the proprietary dell case, you would have to run it outside the case or some other custom way of mounting it as dell doesnt use standard parts in this machine.
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