System will not boot, no green light on mobo.

February 21, 2012 at 11:24:08
Specs: Windows XP PRO, AMD 2.5 Ghz 4gigs DDR ram
No green light on MB. Sys will not BOOT at all. I had to do a HARD shutdown because of a freeze-up and Cont/Alt/Del would not work. Afterwards, computer would not boot at all. No GREEN light on Mobo. Sent board to Gigabyte and about five weeks later they sent what looked like a brand new Mobo back to me without ANY type of explanation. Installed everything as usual; still NO boot nor any GREEN light on Mobo. Tried brand new Antec PS and still NO BOOT and still the green light on the Mobo will not light up. Nothing, Nil, Nada, HELP, HELP, HELP I am running Windows XP Pro, Gigabyte MA790XT-UD4P MoBo, NOW a brand new Antec 650 Watt Power supply <<< replaced the older one after I thought it had possibly burned out. Two Seagate 750 Gigabyte Hard Drives, and 4gigabytes of Ram.

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February 21, 2012 at 11:34:11
Disconnect all drives and try booting again.

All that is needed to POST (boot) is the following hardware: Motherboard, CPU w/HS/fan, 1 stick of RAM, power supply, graphics card or on board, monitor, keyboard. No other cards, RAM, mouse, cabling, etc.

Only connect the power supply to the motherboard. Main 24 pin connector, auxiliary CPU power connector, any power connectors required on a graphics card. Be sure the CPU fan is connected to that header. Momentarily touch the 2 start button motherboard pins with a screwdriver to start the system. Unplug to stop.

You may have something like a dead hard drive that is stopping the system from booting.

Did you clean off the thermal material on the CPU and then apply new thermal paste according to directions for your processor?

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February 21, 2012 at 12:21:09

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February 22, 2012 at 20:19:33
Sir Othehill...... exactly what two pins are you referring to on the mobo that I am supposed to short across..... Can a bad Hard Drive keep the green light on the mobo from coming on at all...... I find it hard to believe that GIGABYTE would take my board for close to six weeks, then return it and not so much as make one comment regarding what was wrong with it. Matter of fact, the board they sent back to me looked a bit different than the one I sent to them but it looks really GREAT BUT I noticed that it has the exact same serial number as the on Ithat I sent to them and IF vit is the same one it surely looks spiffed up to me anyway.

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February 22, 2012 at 22:51:19
The two pins are the two pins that are marked power. The wires that normally go on those pins are the wires that come from the case front panel power button.

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