Fans run without turning on front switches

First thing to check with a desktop computer problem, is the Power Supply.

No sir,....cannot ASSUME power supply is good, because LED's light up, and fans spin.

1) If ALL the LED's were lit up at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor (CPU) can use 51 to 125 Watts of power.
Just depends on what Processor it is.

Intel Core i7, model 950?

http://en.wikipedia.org/wiki/List_of_Intel_Core_i7_microprocessors#.22Bloomfield.22_.2845_nm.29

Up To 130 Watts. (TDP. Thermal Design Power, or Thermal Design Point. Whichever you prefer )

Exceeded the spec's I stated.

Power Supply with a weak voltage rail, will have enough power to turn the wimpy little LED's on, and spin fans; but will NOT have enough power to turn the Processor on.

How to know?

Test the 3 main voltages coming out of the Power Supply, with a multimeter set to DC Voltage;

Or,

Temporarily substitute the Power Supply, with a KNOWN to be good, Compatible one.

Borrow from a working computer. Then you can diagnose if this is the problem; and can put it back in the working computer.

The motherboard you have needs at least 150 Watts.
CPU = 130 Watts
Each ram memory module = 15 Watts (DDR3 Sdram)
Harddrive and optical drives around 25 Watts each.
Fans 2 to 3 Watts each.

Your CPU requires 3 ram memory modules at least. 6 can be used.
So........
150 + 130 + 45 + 50 + 6 = 381 Watts.

Bare minimum is 400 Watts, and you should have a 500 Watt power supply. Need at least 10 percent over what is needed; but why play around? 500 Watts.

http://www.asus.com/Motherboards/P6T_Deluxe_V2/

http://extreme.outervision.com/psucalculatorlite.jsp

Have a multimeter?
(An economical model can be purchased for as little as $5 to $12)

1) ALL Orange wires are 3.3 Volts
2) ALL Red wires are 5 Volts
3) ALL Yellow wires are 12 Volts.
ALL are DC Voltage.

In comparison two D cell flashlight batteries produce 3 Volts DC.

ALL Black wires are Ground wires,

http://en.wikipedia.org/wiki/Computer_power_supply#Wiring_diagrams

(Your SMPS is of the ATX technology)

Need guidance in performing this? Post back in a Comment.

Also:
When checking a desktop computer, after checking power; and this does no good;

Have ONLY the Processor, processor fan hooked up, and Ram Memory.
That means disconnect EVERYTHING else.

Harddrive, (Power and data cable), optical drive, (Power and data cable), computer case fans, (NOT processor), Card Reader cables, Front Panel USB cables, etc.

All you are trying to do at this point, is see if you can pull the BIOS Setup screen up.
If so then add Harddrive, and computer case fans.

[ Note* This is a fast test. BIOS Setup screen comes up, turn the computer off.
CTRL key, ALT key, and Delete key AT SAME TIME.

You don't want to overheat the motherboard. Primarily the Northbridge chip, and Southbridge chip; of the motherboard chipset.

You're just performing a fairly fast test ]

Intel Core i7 requires THREE ram memory modules, at least.
People have used two, but do not apparently understand the Nehalem technology, and using an Intel Core i7.

http://www.hardwaresecrets.com/article/535

Go to Page 2, middle of page.

For additional questions please post in a Comment.
Regards,
joecoolvette

[ By the way,............if your computer comes to life..........RUN!

It's an inanimate object! lol!

(Day the computer became alive!

See how it took over it's owner's mind, and made him search the internet for the rest of his life!

What evil lurks in a desktop computer's mind? (Processor)
ONLY the SHADOW KNOWS! )

http://www.youtube.com/watch?v=2rqd8Oa-sA4

Turn the computer off.
Remove the side-panel, to expose the motherboard.
Turn the computer on.
When you see PRESS <blah> TO ENTER BIOS SETUP, press the <blah> key.
Use the "arrow" keys to move around the BIOS SETUP menu,
looking for any "system health" menu-entry.
Press the "enter" key to select that menu-entry.
It should report the current motherboard temperature, and the current CPU temperature,
and the temperature-limit, beyond which the motherboard will force a shutdown.
It may also report the speed of the power-supply fan, the case fan (if installed), and the CPU fan.
Also, take a look at the fans, to confirm that they are spinning.
Replace any non-functioning fans.

I like that. Kinda' rhymes. "Fan OK but no Display"

Problem is your Processor isn't turned on.

You have a bad Power Supply.
> Weak voltage power rail.

You probably have a 200 to 300 Watt power supply. (SMPS)

1) ALL of the LED lights together use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts.

3) A typical Processor can use 51 to 125 watts. Depends on what Processor it is.

The Intel D845GVSR motherboard uses a Socket 478 processor socket.
Supports Intel Celeron, Intel Pentium 4, and Intel Celeron D, that utilize a Socket 478 processor socket, and have a maximum FSB of 533MHz.

http://en.wikipedia.org/wiki/List_of_Intel_chipsets#Pentium_4_Chipsets

Utilizes the Intel 845GV motherboard chipset.
[ Intel 82845GV Northbridge chip, and Intel ICH4 Southbridge chip ]

89 Watts is the maximum wattage, that can be used by a Processor for the Intel D845GVSR motherboard.

Power Supply has enough power to light LED lights, and spins fans, but not enough to turn the Processor on.
No Processor operating, No computer.
No computer, No video signal to the monitor.
(No Signal)

Do you have access to a KNOWN to be good, compatible Power Supply, for a test unit?



Motherboard Manual in PDF file form:

http://www.intel.com/p/en_US/support/highlights/dsktpboards/d845gvsr

Under the heading > Documents and Guides, left-click on > Product Guides for D845GVSR.
Then left-click on the first file listed.
Product Guide - PDF File Name: D845GVSR_ProductGuide_English.pdf

if it's switching its self off after about 10 second then Your CPU Chip is not right some how it could be / damaged / the wrong socket type for the board as alot of CPU's are very simmler / The CPU's (4 pin) power supply is not connected or the CPU hasent gone in to the socket properly when this happens it will power up but will send no power to the monitor, or somtimes set off an alarm that sounds like a sciron going off.

CHANGE POWER SUPPLY..OTHERWISE REPAIR MOTHER BOARD

If the power supply is good then your motherboard must have gone bad during a surge.

Check the power supply switch of your cpu casing, make sure that it will not stuck when you switch on the power.

Check your RAM card and Video adapter .Because problem of one of that thing computer wont on the monitor video.

Hi nkda2000, this is as close as I could find for power schematics. Intel D865PERL
http://support.intel.com/support/motherboards/desktop/D865PERL/sb/CS-027143.htm

(There is no Intel D865PERLL board). Sure it's a typo. Have done searches for D865PERLL & found it (Not on Intle's web site) but when looking at the specs it's listed as D865PERL. (One L ) not two.

I hope the Technical Product Specification pdf can help you check the power on the motherboard.

Luck!

Mike

This is not a problem with the wires. This is a failure of the motherboard and/or powersupply.

Try the following:

1. Take any components that are not necessary to boot the computer. Try turning it on again
2. Try taking all parts (motherboard, power supply) out of the case and then put them back in (I know that sounds weird, but it has worked twice for me before).
3. If you get to this step, either the motherboard of power supply is shot. The easiest to try would be a power supply. Replace it if you have one laying around or borrow one out of another machine for troubleshooting purposes. This is assuming they are standard ATX power supplies.
4. Place your finger on the heatsink for the chipset. Feel around for any extremely hot chips. If you find this, your Bios is shot. If you cannot locate the bios chip, just feel all the chips. The Bios chip should be mildly warm but never HOT!