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Missing bios, and power supply/switch problem

Cant seem to get the power switch plugged in proper pin order need schematic or picture of this plug pluged in the proper position
Secondly need proper order of dvd/cd player as noted on plugs on this unit they are numbered p2 and p3 on one teather ! p4, and p5 on another! p6 and p7 on another ( p7 is smaller and plugs in to 3 1/4 drive . this unit was stolen and they unpluged it all, however I had it all working again (Not bad for novice with no knowledge. but had to re instal WIN XP because of virus (didnt know any other way (no Im not BLONDE ) ! Completely cleaned every Sq centimeter of inside but am not sure of proper boot seq by top to bottom order. Top is dvd (factory) @nd down is addon dvd burner, and 3rd is 3 1/4 and 4th is hd. Could not instal XP or repair because dvd nd dvdburner are shot so I removed hard drive and instaled in another computor and re-installed XP from burner dvd in that computor Asuming That I can get power on and buy two new dvds and plug everything in the right order then I will be in business. However i am not in a financial position to pur new dvds at this time ( 60yrs old and broke on ssi ) How can I re-instal bios (NTLDR) Is this file mising from bios on motherboard or files in XP on hard drive Can YOU HELP DOWN AND OUT IN COLORADO Nov 4th 2008 Election Day 08 Thanks JIM

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Hi Jim!
First of all I'm from Sweden and I'm writing this 3 o'clock in the morning so there might be some spelling errors ;)

Yes, the powerswitch can be a real pain. since you need the schematics of your specific motherboard... to get this you need to know what model your board are. typically its written somewhere on the board with slightly larger letters/numbers than the rest, OR, if it's a typically brand computer (HP, COMPAQ, DELL, IBM etc.) with its original board you should be able to get the model number by just looking at some number on the computer case. example: DELL OPTIPLEX GX270 and seaching for that computer model on ther website. can't promise that they will give out any schematics though...but its worth a shot ;) If you cant find any schematics for your motherboard just post the model of your motherboard here and ill see if i can provide some feedback about it...

About the CD/DVD, try to boot with just 1 device powered up at a time, since basically CD's and DVD's are the same when it comes to interfaces like IDE. so either go with the DVD player OR the CD-ROM player to make it easier to find out whats wrong. After you have installed XP successfully you can try to connect/add the other device and boot up the computer again -XP should install it automatically.
Furthermore with the DVD or CD (whichever you want to try installing XP with). the cable connecting it to the motherboard and the DVD/CD should be in the SECONDARY IDE port on the motherboard (PRIMARY IDE port is for the HDD -Hard Disk Drive) and the jumper or "plug" on the dvd should be set as MASTER (should be a sign like "MA" or something, usually theres just those two pins that needs to be connected) there should also be others like SL for SLAVE and CS for CABLE SELECT but you wont need to bother about them. Master means the primary drive (the one that boots first on that channel, when installing win xp for example, this drive is the one that should contain the CD or DVD) Slave means a secondary drive - works as normal once in windows but is not preferred to install the base OS from. Cable is meant for the motherboard to decide wheter the device should be master or slave depending on which port on the cable it is connected to. also with the IDE cables; the port that are farthest away from the motherboard connector is the MASTER port. a rule which is not so clearly described.

You might need to enter the BIOS too to select the DVD drive as the default booting device in the boot order... usually its ranked from the top where the device on the top of the list is the one booting first.

Regarding the "NTLDR missing" (NT Loader) problem its just a file in the windows structure that is not recognized since you installed the OS (Operating System) in another computer.
Installing Win XP to a harddrive in anoher computer will most likely not solve your problem, as Win XP is based on the NT (New Technology) it isn't as flexible as older systems eg. Win 98. Your only real shot of succeeding in this matter is to simply install on the very computer that should hade this drive by default. (read: the computer your having trouble with)

Hope this helps out somehow, it would be nice to hear how this project ends up.

PS. For the record, my haircolor is blonde ;)
Hope this doesnt discourage you too much after reading this confession.

Best regards

Posted on Nov 05, 2008

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My Intel E54926 motherboard won't switch on,the power supply works on another board,power led light is on when I plug my power supply in,which shows it has power but still no power to switch it on?

Things to check : bent or missing pins on the processor. Power switch on the case may have jumped a pin if you have removed it . Make sure the 4 pin power cable is fully seated on the motherboard if it is used.
If none of these places are the problem, then it's possible there are too many domed electrolytic capacitors on the motherboard which would stop the power ok signal from the motherboard from reaching the power supply.

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I have tried running 2 different M4A79 deluxe motherboards with a corsair 650W power supply, phenom I X4 processor, and an nVidia 9800GT video card but neither of them will so much as turn on with...

It sounds like the ATX power supply is not getting turned on by the motherboard.
In order for this to happen, pin 14 (PS_ON*) of the 20-pin ATX power plug from the power supply must be pulled to ground. You can test this by plugging the power supply in to AC power without it plugged in to the motherboard.

Using a paper clip, short pin 14 (PS_ON*) to pin 15 (ground) and the power supply should turn ON.

Looking at the front of the 20-pin plug, with the latch on the top, pin 14 is the 4th from the left
_________________' '________________
' 11 ' 12 ' 13 ' 14 ' 15 ' 16 ' 17 ' 18 ' 19 ' 20 '
' 1 ' 2 ' 3 ' 4 ' 5 ' 6 ' 7 ' 8 ' 9 ' 10 '
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If you can turn on the power supply by shorting pin 14 to ground, but it doesn't happen when plugged into the motherboard, there is most likely a jumper setting on the motherboard which has not been configured correctly.

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1) Installing? I don't think this is your problem/question, but............

Processor on the motherboard, Thermal paste on the top of the Processor, Heatsink/Fan combo on on the top of the Processor.
Ram Memory Installed.
Motherboard installed in case.
Graphics card installed, and all other add-in cards.
Optical and card reader drives installed.
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2) Are you are looking at the order in which BIOS recognizes the devices?

You press the Power On button.
The plastic Power On button assembly presses against the Power On switch. The Power On switch is located inside the plastic Power On button assembly.

Example of a typical ATX power on switch,

When the Power Supply is plugged into power, there is a constant 5 Volts inside the Power Supply.
The 5 Volt Standby power.

Pressing the Power On switch closes the switch temporarily.
(The Power On switch is a Momentary Contact Switch)
This redirects the 5 Volt Standby power to a different circuit in the Power Supply.
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The Power Supply comes on.
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BIOS looks to see what devices are installed, both on the motherboard, and external peripheral devices.
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i cant remember any 2 pin plugs on the computer side and i have taken quite a few of these apart. there is a four pin plug...

wire colors,
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red 5 volt,

if the old supply was any of those colors you can desolder from the old supply and re solder it onto the new supply. if it was another color then i would suspect a random signal wire or cutout, keep you from frying yourself with the case open... try plugging up the new supply and turning on the computer if it runs why worry about it?

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Watch for the new power supplies and your drive connectors as some of the new power supplies have limited ATA plugs...if you have a lot of ATA devices you might need SATA power convertor plugs or ATA splitters to get all you ATA devices up.

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1 Answer

Mb have power but not start...

Hi, good day sir, there are several things you should do first.
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3. Clean the memory port from any dust, plug the RAM module, make sure also the module connector is clean.
4. Plug in the speaker and power switch.
5. Connect a VGA monitor.
6. Reset bios/cmos or simply operate the pc without the battery.
7. Plug the Power Supply to AC mains.
8. test the PC.
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Please don't forget to rate this solution.

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to check case switch and board switch

1.) plug in power supply to main board
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