Can someone tell me why a Dell Inspiron 530 will not power up with a new 400W Dynex DX-400WPS power supply? the old power supply (350W) still works, but I need more power to support better video cards. Its a strange problem: the power button on the PC lights up, the LED on the mother board lights up, but the PC won't start up. The power supply does not appear to be malfunctioning and all power cords WERE correctly installed.
I would say you got a bad power supply unit. The fact that the system works with the old PSU kind of proves that. Is there any way you can test the new PSU in another computer?
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Along with the 24 pin power connector for the motherboard, did you connect the 4 pin Molex connector (DC power connector P2)? That is a connector that is often overlooked when installing a new power supply.
But going from a Dell 350 watt power supply to a Retail 400 watt didn't really get you anything. Dell power supplies are generally "conservatively" rated and a Dell 350 watt is more closely like a 375 or even 400 watt power supply. If you need more power, go for at least a 500 watt power supply.
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fireberdBut going from a Dell 350 watt power supply to a Retail 400 watt didn't really get you anything. Dell power supplies are generally "conservatively" rated and a Dell 350 watt is more closely like a 375 or even 400 watt power supply. If you need more power, go for at least a 500 watt power supply.
+1. Especially on the lower quality Dynex model that only comes with a 1 year warranty compared to most that have at least 3 years or more for the same price.
What video card are you planning on using? I would bet it would work just fine on your 350W unit if it states it only needs a 400 watt power supply.