Hi Guys,

Just joined. Need to ask something that I am unable to get answer anywhere.

Anyways here the short story,

I have an MSI 750i Motherboard, and its installed in a Mid Tower casing, I am using Corsair HX1000W PSU with it, and 2xGTX260 in SLi.
Here is what happened.

The Motherboard earlier a month or so ago wouldnt boot with RAM in its 2 Slots (orange ones) so I used single channel (2 Green Slots to make it work)

Later when I changed the Processor, it booted fine, but after I went in the BIOS and raised the FSB and voltages to the CPU (Minor increase, much lower than the previous) during Boot the System was shut down.

When I pressed the power button LED (Red) on the motherboard was on, when pressing the power button the Fans and Fan LED turned on for a Fraction of a second and then the system shut down, though the red LED on the board was on.

I changed another PSU, and tried but same result,. changed the Processor but same results. I removed the Processor.

After sometime I put in the Power and hit the start button same thing happened, BUT there was electric current (mild tingly) running in through all the casing and system, i didnt understand what was it, anyways when I hit the power button smoke came out from this part (Pic)

I know that the Board is dead, but I am about to get new Core i7 Set up, and considering its expensive, I am spooked as to what did this. PSU (Both are new) and i gave them the Clip test and they started. Casing is Generic, could it be at fault?

I need some GOOD Advice as to locate the fault.

THANKS

Anything can cause this (short in the board) as ALL parts internal are connected electrically.

Since you said you felt elec. from the case something is shorting from a power to the case. Could be a screw or something stuck between the board and case, power supply shorting etc. Could have been any component, just because something is new doesn't mean it can't fail.

Also if you do not have the proper anti-static devices to ground yourself when swapping components you may have caused a fault in an IC somewhere.

wikipedia

The only way to test most components is in another PC setup.

If it were mine, I would definitely get a new PSU and strongly consider new RAM and CPU too.

Thanks for the reply dude.
Well I checked the PSU (as i said there are two with me Corsair HX1000W and PC Power and Cooling Silencer 750W) And they are starting fine bith.
I Powered up the Hard disks and attached them to Lapptop via a USB adapter and they are working fine (PHEW!!!! THANKFULLY) I have checked with a Multimeter various power pins of the PSU and all are getting volts, the CPU cable is giving 12V in all 4 Slots, so is PCI-E cable, Hard disks one 12v and the other 5v (i think) and the mobo leads are giving 12v, 4(I think) and somewhat similar (forgot ) So I guess the PSU is fine.

Do you think that the Processor or RAM could have cause it?

And for the PSU it was working fine for the past 1 month, then after the swap for Processor it started.

Hmm may be you are right that there might have been a shortage in Board.
One question, please can you guide me to Testing PSU (Other than what i did)

Again thanks for the help.

Other than buying a separate tester specific for the PSU what you did is fine. as long as you know what voltages are within a normal range for each output pin.

Google - test power supply multimeter

Thanks mate for the help.
Both the PSUs are giving good volts on all the rails or cables what ever we will like to call em
SO what could be the problem? Mobo?

The picture that you supplied is showing what appears to be a small can filter..
These things can go out at any time and can also lead to a short to the case as they are attached to the ground side of the mobo and can transfer the slight current to the case...etc.

someone told me that it is Voltage regulator.
So i guess it would be Fine for me to use these Power Supplies with my Rig
A bit nervous. BTW one cable in the Mobo Socket was giving Negative 12 volts, both PSUs is it ok?
Again guys appreciate you taking time for helping me out.
Thanks

go to the power supply manufacturer and see what the specs call for in that socket! That would be the best way to check. I for one am not sure what the values are as I have never needed to know it...(I have a psu checker)

Please can you give me the Link for the PSU checker,
THANKS

This is not the one I use as they quit making them a long time back
Newegg.com - Rexus PST-3 Digital Power Supply Tester with LCD - PC Tools

This is similar to what I use. Just plug it in and it lets you know if it is good or bad. Plain and simple!
Newegg.com - Rosewill RPST-24-A-01 20/24 Pin Power Supply Tester - PC Tools

For the money either one is worth the time to have around!