Question about Dell HP-P2507FW Power Supply ** FREE DELIVERY ** (HPP2507FW300WB) Power Supply

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Dell HP-P2507FW Power Supply

I have this power supply in my Dell 3000. The cooling fan that blows across the heat sink works an so does th fan inside the power supply. None of my USB ports work when I plug something into them. My monitor only shows message enabling power saver mode, push any key on keyboard. I cannot do this because the UB keyboard does not work. Question is how do I tell if my problem is my Motherboard or my power supply?

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Before Working Inside Your Computer Dell HP-P2507FW Power Supply - notice.gif NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.
You can try resetting the motherboard.To do the same follow the following steps

1. Disconnect all the cables from the back of the computer
2. Look for a silver coin shaped battery on the motheboard.
3. Pry the battery out using a filer or falt head srewdriver. Be careful not to damage the motherboard
4. Press the power button in the front for 5 seconds
5. Reinsert the battery
6. Reconnect the keyboard ,monitor and power cord and power on the system

for advaced troubleshooting refer to the following link
http://tinyurl.com/5cs2we

Thanks
Proton

Posted on Nov 01, 2008

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THE FANS WORK BUT NOTHING SHOWS ON THE MONITOR AND ITS QUIETER THAN USUAL


1.Cooling fans work?
2.No Signal shown on monitor?
3.Harddrive doesn't make any noise? (To explain. Harddrive is inactive. Not spinning, and the arms aren't moving back, and forth across the platters)

Suggest it's a bad power supply. A common occurrence.

Why?
1.Owner fails to keep the inside of the computer clean, and the power supply.

Dust/Dirt/Spider Webs/Lint, you name it, builds up inside. This foreign material clogs up cooling components. Specifically the Processor fan, and Heatsink, plus the power supply fan, and heatsink's inside the power supply.

Result?
Processor heats up. Takes more power to run, until eventually it turns off. (Processor's have a thermal limit. Once this thermal limit is exceeded, BIOS turns the processor off)

Power supply heats up. Fan blades and center hub collects Dust/Dirt, as well as heatsink's inside the power supply. Cooling capacity drops tremendously.

Heat = Wasted Energy. The power supply puts out more, and more power to keep up. Eventually components inside the power supply fail. They burn up. (More on this to follow)

2.Cheap power supply. Cheap construction, and cheap materials used. Pre-built computer manufacturers generally use cheaply made power supply's. Saves them money.

A.Gauge of wiring used inside is too small.
B.Electrolytic Capacitors used are of an inferior design, and of cheap quality.
C.Circuit design is below par.
D.Other components used are of low quality.

So how does a bad power supply still light-lights, and spin fans?

Bad power rail.
Personal computer power supply's put out three main voltages.
A.12 Volts
B.5 Volts
C.3.3 Volts

Electrolytic Capacitors used in a power supply are Filters. They filter the incoming AC electricity, and the rectified DC. When one or more capacitors fail, or are failing, a bad power rail results.

1.ALL the lights uses less than 1 Watt.
2.EACH fan uses 2 to 3 Watts.

A typical Processor uses 55 to 125 Watts. Depends on which processor it is.

So you see, you can have enough power to light those lights, spin fans, and even spin the harddrive motor, but not enough to turn the processor on. (Or if it does turn on, not enough to keep it running)

You can easily prove it's the power supply at fault, if you have a known, good, power supply to use for a test.
Another 300 Watt unit that has the same power cables. (Should be stated as has at LEAST the same power cables. It can have more power cables, and these just won't be used)

No processor running you get no signal to the monitor. Computer isn't working to give a signal to the monitor.

Computer is quieter than normal, because you don't hear any harddrive noise. No processor running to access the Operating System on the harddrive. (Or programs and applications)

(Windows XP is an example of an Operating System. O/S)

Just for information, this link gives details of the components inside a harddrive. Gives you more info about the Arms, and Platters I referred to above.
Just thought I would include it. It is not advertising for this website, but is included for reference.

http://computer.howstuffworks.com/hard-disk.htm


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To eliminate a software problem, I installed another hard drive with the same operating system, and the problem still existed.
I also flashed the BIOS with no results.


The most logical conclusion is that the problem lays with power supply.
A new power supply was ordered today.

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