Just purchased an ECS 755 a2 motherboard with an Sempron 3400+ *64-BIT* (754 / 2.0GHz / 384K / 1600FSB) proc and we installed the motherboard with proc and memory and new ATI video card and it will not post or boot no beeps and header pins will not allow the buttons on front to work correctly except to turn the power on.

HELP!!!!!
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Edit: Just wanted to make sure I said there is NO display and I am using a 250W power supply.

Well first of all I would say your power supply should be 350 watts or more.And sounds like maybe something didnt get plug in some where ,You should get something ,try this ,may work ,It happened to me ,unplug the power supply cord from back of computer and plug back in,only saying this cause one of the computers i built wouldn't start ,nothing ,I unplug cord and for some strange reason it booted /ph34r.gif' border='0' style='vertical-align:middle' alt='ph34r.gif' /> does the ati need power?


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Check here for PSU wattage requirement:

http://www.extreme.outervision.com/index.jsp' ">http://www.extreme.outervision.com/index.jsp

Definitely too low for that type of setup. What video card are you using?

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Well first can you provide some more information about the power supply you have? Model number/maker etc. ONe thing that is really important is +12V line and how many amps it has on it. This power supply sounds weak just by the description. I run Athlon 64s just fine on 350watt Antec Smartpowers, but I have never run an Athlon 64 series based proc on something less than that.

Lets say if your power supply is good enough, usually if you get no beeps it may be do to a dead motherboard. If you remove all the ram do you hear any beeps?

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Make sure that your cmos clear jumper is in the correct position as some mobo's come shipped with it in the clear position.
Try resetting your cmos

good Luck

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Also make sure that the little pins in your 4-pin power connectors are all still in their slots.

I had the same problem yesterday with it just booting to a blackscreen; no beeps; no text. It turned out that one of the connector pins got pushed out (through?) because the little plastic bit surrounding it wasn't tight enough or something. I just pushed it back up in there till it felt secure and it booted to POST just fine.