Question about MSI 915P NEO2 PLATINUM 915P LGA775 800FSB 4DDR2 AUD+GBE PATA RAID SATA (7028030020050) Motherboard

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Wont boot up or start - cpu fan does spin but switches off

1..Checked main atx plug 24pin and 4 pin power plug. AOK
2..Checked, removed, replaced , 2 sticks of ram AOK
3..Checked, wiring to HD led,PSW + led AOK
4..Disconected Power Plugs and Ribbions to 3 Hard-Drives plus SATA Drives
After checking all of the above, system still did not start or boot up, however intermittenly when you press the switch the cpu fan would spin then stop.
Finally I changed the PSU from another machine that was working, and Yes it booted up and I was able to do whatever. UNTILL 5 hrs later
same problem again.I'am at a loss , where do I go from here. ?

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  • Mark Kessler May 11, 2010

    When you replaced the psu, did the cpu fan work ok for the specified time?



    How long has this problem been occuring?



    Did you upgrade or replace something just before the problem first occured?

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You seem to have a lot of hardware in there, so trying to remove some items to lighten the Power Load was a good idea - but maybe too late.

Check your Power Supply - I suspect that you will need around 550 Watts or more. If you can put in another Power Supply (after disconnecting as many drives etc as you can) see if the problem re-occurs.

If it does not, then your Power Supply is failing and will need to be replaced (with a 550 Watt or above PS Unit). I would personnally think that a 700 Watt unit would be ideal if it were my machine.

Yeah, I know you said you replaced the Power Supply but didn't say if everything was reconnected nor what size Power Supply Unit you put in.

Good luck.

Posted on May 11, 2008

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Have a new Urban S71 case with Super X5DP8-G2, checked it by connecting blk and green wire on 24pin ATX power connector on the Corsair TX650 v 2.2 cpu fans and case fans all operate. Blue high low fan...


It booted up once, and now fails?

Quite likely it is defective. If it booted once, it should boot again.

Make sure the little SQUARE 4-wire plug from the power supply is also plugged into the Mobo. Commonly overlooked, and can drive you nuts trying to figure out.

Best 'o luck, Barry.

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I have got a system with an Aopen motherboard which having only a 20 pin connector for smps connectivity. the Atx smps i have is is 24 pinned. i can connect the main line by splitting up the 24pin...


The actual Processor fan connects to the CPU Fan header on the mainboard. It's 4 small pins. It plugs in right near the CPU socket on the mainboard. Check the user manual for exact placement, you may download it from the AOpen website if you don't have one already.

Plug in the 20Pin connector if that is the most Pins that the mainboard will allow. Cable tie the other 4Pins back onto the 20Pin connector.

Then if there is additional 4Pin connector required by the mainboard for CPU power and you don't have that connector on you power supply, you will need to purchase a Molex to 4Pin CPU power connector. When you go to the computer store check with them that all is correctly connected.

Take care!
damnor01

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Do not turn on I change the power supply and still doing nothing


Assume you have made the connections on the main atx plug to the motherboard AND the smaller 4 pin Black and yellow wired plug (cpu power).

If the PSU you have just installed was sure to be a good one, then the issue lies with the motherboard or the switch to the power supply on the board (2 pin wire connector labelled PW). Try to remove the connector and then bridge the connection manually with an insulated screwdriver by BRIEFLY touching the 2 pins on the board. If the switch was faulty, this will bypass it and the computer will boot.

If it still will not boot, try removing all non -essential components. leave only 1 stick of ram and the video connection. if it boots, replace each in turn and see which one causes the computer not to boot.

If that fails, examine the board carefully, look closely at the capacitors ( small cylinders) on the board if any are bulging or the top is leaking a rusty coloured crust, the board is dead and will need replacing

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Compaq sr1350nx Well, just installed a new motherboard and replaced all the parts correctly as they were. Checked all connections fired it up and actually got a screen with a few numbers then a blinking...


It IS the Power Supply cjshearer11.

The green LED light flashing is a diagnostic light now. The diagnosis is a bad Power Supply with a Gree LED flashing.

Secondly, notice how the accessories are unplugged, and the Green LED light is solid Green?

1) ALL of the LED lights combined 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.

Compaq Presario SR1350NX?
Uses an Intel Pentium 4, Model 519 (LGA 775 processor socket)

3.06GigaHertz maximum frequency rate (3.06GHz 'speed')
533MegaHertz Front Side Bus. (533MHz FSB)
1MegaByte of L2 cache. (1MB L2 cache)
Can use up to 89 Watts,

http://en.wikipedia.org/wiki/List_of_Intel_Pentium_4_microprocessors#Prescott_.2890.C2.A0nm.29

You press the Power On button. Inside the plastic Power On button is a Power On switch.

(Typical ATX power on switch,

http://www.directron.com/atxswitch.html )

The Power On button presses against the Power On switch making a momentary contact.
(The Power On switch is a Momentary Contact Switch)

This closes a circuit temporarily that has 5 volts present. The 5 Volt Standby power.
(The 5 volts is always present when the Power Supply is plugged into power)

The 5 Volts is directed towards a circuit within the Power Supply.
The Soft Power On circuit. (PS_ON)

This in turn 'excites' the Power Supply, and turns the Power Supply on.
(No pun intended)

The first chip on the motherboard to receive power is the BIOS chip.
(Chip and Chipset are slang terms for I.C.
Integrated Circuit)

Burned into the BIOS chip is a small program. The BIOS program.
The BIOS program looks to see what devices are installed, does a Ram Memory count, TURNS the Processor on, and hands the computer over to the Operating System.
(Windows XP, and Windows Vista are two examples of an O/S)

Your Power Supply has a weak voltage power rail.
(There are three main power rails in the SMPS in your Presario computer's Power Supply.
{Switched-Mode Power Supply}
The 3.3 Volt power rail, the 5 volt power rail, and the 12 volt power rail)

Enough power to light LED lights, and maybe spin fans, (Or spin a few times, and stop), but Not enough power to turn the Processor on.
NO Processor operating, no finding the boot record of the Operating System, on the Harddrive.

Do you have a KNOWN to be good, compatible power supply in an unused desktop computer, to use for a test unit?
Someone you may know may have upgraded to a better computer, and have a working computer with a Power Supply that you could borrow.

Needs to be an ATX form factor Power Supply.
Form factor for a Power Supply refers to the size, and shape of the case, for one.
It also applies to the power cables coming out of the power supply.

The size and shape of the case is;
6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall.

Needs a,
A) 24-pin ATX main power cable,
B) 4-pin ATX +12 Volt power cable,
C) Enough standard 4-pin Peripheral power cables, for the optical drive/s (CD/DVD drive/s),
D) One SATA power cable

A) 24-pin ATX main power cable:

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

B) 4-pin ATX +12 Volt power cable: (Power for the Processor)

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

C) SATA power cable: (Power for the SATA Harddrive. 15-pin cable)

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

D) Standard 4-pin Peripheral power cable:

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

The ATX power supply inside that Presario, is probably rated at a maximum Wattage of 250 to 300 Watts.
Made by some generic Power Supply manufacturer.
Bestec, HiPro, or Delta.
Around 90 percent of the desktop PC's out there use an ATX Power Supply.
You can buy one with as much Wattage as you want, won't hurt the computer.
A computer ONLY uses the power it needs, and No more.

Regards,
joecoolvette

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Did you flash the main board ??

1.) remove battery
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It could also be the power button is stuck!.

find were it connects to the main boad and unplug it
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Hello,have you installed new motherboard or CPU?
Follow these steps again
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2) Wear an anti-static glove or at very least discharge your static by touching a metal surface or power supply

3) Disconnect the main 20pin ATX power connector from the motherboard & the square 4pin ATX2 power connector

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