Supermicro x9dai won't post, beep, boot or much of anything else

SOURCE: System will not start up. Cpu fan spins once, then nothing.

It is more than likely that when your old power supply died a death, it damaged some components on the motherboard. Replace the Motherboard and chip, and you should be back in business. You can pick up some good value bundles to save money on buying the parts seperately. The power supply working again after turning off and on, is because there is a little trip in the power supply that triggers when it detects a fault. Powering down resets that trip allowing it to try and work again.

SOURCE: WINFAST 760GXK8MC motherboard problem

It's possible that while booting your motherboard without the 12V power connected you physically damaged some components which eventually lead to the chip burning up.  However, it is quite possible that this motherboard was defective as Foxconn has discontinued it.  I would recommend RMA'ing (return merchandise authorization) the motherboard back to Foxconn.  While no one wants to wait for shipping it is probably your best bet.  Even if you order the chip that has been damaged, and can properly solder it back in place, there will most likely be other physical damage that is not visible to the eye.  I would recommend another motherboard, and Foxconn has quality mobo's for around $50.  Try visiting www.newegg.com. Hope this helps :)

SOURCE: gigabyte MB no boot ga-ma790fx-dq6

did you replace the battery on the mainboard if its weak it will not beep

SOURCE: SuperMicro X7DAL-E will not power up

I am using the same board with a PC Power and Cooling 1 K Watt power supply which is a little high in price and no longer available. I have been using PC Power and Cooling since the 1980’s and have had few problems and they have always kept up with the latest power standards if not exceeding them. The replacement power supply has even more power.
However, you can find adapters to use 4 pin IDE drive Power connectors for the 4 and 8 pin power connectors. PC Power and Cooling and Cables To Go both sell them. That is the cheapest fix for you but I would also use the PCI-E auxiliary power connector.
Follow the links:
http://www.pcpower.com/products/accessories/power_supply/

http://search.cablestogo.com/?Ntt=8+pin+power+supply&N=0

http://www.cablestogo.com/product.asp?cat_id=925&sku=35522

SOURCE: I've got a new Gigabyte

Most motherboards now have a 24-pin power supply connector. If you haven't already found a diagram showing the pinouts of the 20- and 24-pin power plugs, here's one borrowed from a handy site:



The two plugs are essentially the same, but the 24-pin version duplicates some voltages on the extra pins. The extra pins in the larger connector were meant to provide extra current paths for voltages that see heavy loads from newer processors and motherboard circuitry. Depending on how a motherboard is designed, it might work with a 20-pin plug connected (leaving pins 11, 12, 23 and 24 empty). But typically if the board has a 24-pin connector it needs the 24-pin power supply plug.

Most power supplies have a 20-pin plug with a separate 4-pin section that fastens to it for connection to a 24-pin mobo connector. It typically has one side designed to slide onto the end of the 20-pin plug, essentially turning it into the 24-pin version. This added plug does not have a retaining clamp on its side, so you can tell it from the the 4-pin CPU power plug. The wire colors are also different. For reference, here is the processor power plug, from the same website:


New motherboard specs call for the separate processor power connector for the same reason the extra pins were added to the power supply connector: to handle the high currents needed by increasingly faster CPUs.

When the motherboard has these connectors, you need to use them all to get everything working. Hope this helps. Thanks to smspowersupply.com for the diagrams, and thank you for using Fixya.

Testimonial: "Thanx - cleared up the confusion about P1. Additional tests are pointing to a d.o.a. motherboard."