Dell Dimension 9150, flashing orange light on front power button. I noticed an orange light flashes on the ethernet port when plugging in the power cord, but it wont power up? Any suggestion, please help!

If the port works, it should be steady yellow. Flashing means that your Ethernet circuit on your motherboard has a problem.

http://shop.ebay.com/i.html?_kw=panel&_kw=dimension&_kw=5150
Front IO Panel contains the actual power switch

The orange flashing light on the power button is an indication of power supply failure.

Your Power supply unit needs to be replaced.

It's likely that your power supply has started to go out. There are several different leads with varying voltages & amps. If your computer is getting enough power to make a light flash yellow or orange then this often means that there is something wrong with one or more of the voltages from the power supply. Sometimes it means that something is wrong with your motherboard. Like: burned out capacitors, resistors, & etc.

Flashing Amber is normally power supply

http://www.fixya.com/support/r4282412-find_no_post_diagnostic_information_dell

The USB ports are part of the motherboard

Amber flashing power LED is normally a power supply failure

Hi,
the constant Green, states that the motherboard is getting Power.
The red/yellow would possibly suggest, that the ethernet port has a fault or possible corruption.
Solution:- remove the Power Lead from the Computer Case.
Remove side panel. take out any ethernet-Cable from the rear.
Locate the CMOS battery, round silver Battery on The motherboard.
For 10 seconds, this should reset The bios, to it,s original Default Settings. Replace Battery, side Panel. And power Lead.
You could also try This. Boot with Hard-drive power Cable Disconnected ( this will Eliminate HD Fault ) same for CD/DVD drive et,c.

Mike @ Compurepair.

do you hear the POST beep?

If you experience the dreaded blinking orange power light, make sure to check your motherboard for blown capacitors as well as corrosion on the motherboard. Looks like the photo below.... if you see this then a replacement motherboard is needed.

is this the 400/9150 viewable at the below address? http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&ServiceTag=FBT5D91&SystemID=XPS/Dimension%20400/9150&os=WW1&osl=EN

if so, i actually used to have one! The network port is on the rear of the case, as you can see as number 4 on this image:

http://support.dell.com/support/edocs/systems/xps400/sm/about2.jpg