Question about Dell XPS 420 (dxcwqc1_4) Intel Core2 Q6600 Quad-Core (8MB L2 cache,2.4GHz,1066FSB) 1000GB/2000MB PC Desktop

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Dell xps 420 won't power up - Dell XPS 420 (dxcwqc1_4) Intel Core2 Q6600 Quad-Core (8MB L2 cache,2.4GHz,1066FSB) 1000GB/2000MB PC Desktop

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I gotta know 1st what is ur system configuration..is all ur system is getting power on..is there any sound coming out of the system..
assuming that the bios has not been flashed in a wrong way & u r a professional..

before u proceed to complex checkups..check the mains power supply- the fuse/switch/wirings/power cords/other associate circuits..

probably itz either minor case of loose ram/improper ground/cmos battery..
or major case of faulty or defective smps/cpu/main board short/display adapter or card/monitor

..plz do check the following as in order:..

1) in power on mode, open/unplug the data/vga cable of the monitor from cabinet..see if raster or 'osd' is appearing on the monitor screen..if so monitor is ok..else replace the monitor and see..

2) if u hv a graphics card, replace with a standby or onboard and see..

3) see if the ram(s) is loose/faulty..open clean/remove carbon & or oxide formed on the teeth with an eraser n resit it..or replace with a standby n see..

4) unplug mains supply..pick open/remove the cmos battery..check (above +3v)..resit..

5) remove/clean dust neatly..dust is non-uniform in nature n may cause jam/short circuitry/excess resistace n many more..resulting an increase in heat..

6) open the CPU Heat-Sink with fan out of the socket..put some "Heat Sink Compound" (available in local electronics chip level spare market) between the cpu/processor and the CPU Heat Sink *** fan..resit/fit it tightly in position..

7) the smps itself may b defective/faulty..check the outputs of smps viz. 0v (black~ground); +12v (yellow); +5v (red, green~ps-on, violet~pg & grey~sb); -12v (blue); -5v(white); +3.3v(orange)..
the 'oscillator and error amplifier ic', or pwm switching regulator circuit..look for defective protector-transformer/resistance(esp 4.7k)/mosfet..

8) if itz not the smps, then it must b ur main/mother board..see with a debug card for mb error..may b short..look for defective capacitors(esp above 1000mfd)/mosfets..go through the mb's south bridge n the circuit lie around atx connector..the crystal clock generator (if cpu isn't heating up)....

always better to seek advise from ur system admin/vendor....

Posted on Nov 12, 2009

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Hey! Nice Computer! ( At least while it was working! Specifications show some high-end hardware parts)

Steady amber light on the Power On light, means a bad power supply.

The Dell XPS 420 uses the standard ATX style of power supply found in 90% of computers out there.
(Personal computers. Not the Cray Supercomputers!)

This is Dell Support, and the User Manual - Removing and Replacing Parts - part of the manual,

http://support.dell.com/support/edocs/systems/xps420/en/OM/HTML/parts.htm#wp1466871

From Me:

1) Computer unplugged from power, computer case open. TOUCH the metal frame BEFORE you reach inside.
Your body carries Static electricity.
Static will fry out computer hardware components.
You won't see it, or feel it.

Computer unplugged from power, you are safe.
Touch the metal frame Before reaching inside, your computer is safe.

Should you get up for any reason, walk away, then return, Touch the metal frame again)

You either have a 375 Watt, or a 425 Watt power supply.
I would recommend a power supply with more Wattage, and more Amp's on the 12 Volt power rail.

The Dell XPS 420 comes with an Intel Core2 Duo processor, or an Intel Core2 Extreme processor.

These puppy's can use a lot of power when gamin', or other intense programs are being used.

The Nvidia GeForce 8800 Series of graphics cards offered, use a lot of power when maxed out.

The motherboard with the Intel X38 motherboard chipset, uses a lot of power.

I would recommend a 600 watt power supply for a replacement.

My recommendation would be an OCZ StealthXStream 600W

Why?

1) If the temperature of this PSU is kept under 118 degrees Fahrenheit, the PSU can put out 728.8 Watts reliably. (47.9 degrees Celsuis)

2) It has Four - 12 Volt power rails.
EACH power rail can handle 18 Amps.
That's a total of 72 Amps!

3) It has all the power cables you'll need.

A) 20 + 4-pin ATX motherboard power cable
B) 8-pin 12 Volt power cable (8-pin EPS)
C) 4-pin ATX power cable
D) SATA power cables [ 3 ]
E) Peripheral power cables, (4-pin Molex) [ 6 ]
F) 6-pin PCI power cables. [ 2 ]

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3092557&CatId=106

Not advertising for the above website, nor the PSU manufacturer. Recommendation supported by personal preference, and experience.

Information about the various PC power cables and connectors,

http://www.playtool.com/pages/psuconnectors/connectors.html

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