A couple of possibles could be the mainboard grounding out on the case, or a 
suspect power supply as I didn't catch if this is a completely new build 
with untested parts.  With a known good power supply connected to the 
motherboard with a known good video card, you should see if you can get into 
BIOS to eliminate the motherboard as the problem, then add in the rest of 
the add in cards.  If it boots OK outside of the case with the rest of the 
add in cards, it may be a stand off that is shorting out the mainboard or a 
snug fit of the mainboard in the case that is flexing the mainboard and 
causing it to ground out.  Also check the fan/heatsink/CPU assembly to 
eliminate a mis-seated heatsink causing a thermal shutdown. HTH
----- Original Message ----- 
From: "Paul Hachmeyer" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, June 19, 2007 4:08 PM
Subject: Re: [PCBUILD] push case start button, 0.5 seconds fans start then 
off....first build 06-15-07


>I would start by disconnecting all the drives - cd, dvd, hd's, (both power 
>and ribbon cables), leave in one stick of memory (preferably one you know 
>is good, regardless of size), remove any add in cards unless needed (leave 
>in video card, unless you also have onboard video),unplug speakers, leds, 
>and try to start the computer.   If still no good, then you need to triple 
>check all wiring, jumpers.  Bad mb, cpu, jumper settings, etc., shorted 
>led, speaker problem, are some possibilities.  If it starts, then reinstall 
>one component at a time (power down and unplug each time) test it, repeat 
>until it fails again.  If you are familiar with and have a tester, you can 
>try to check the power switch for continuity with an ohmmeter/multimeter 
>being certain to unplug the power first.  Some switches are momentary 
>contact - that is, they only conduct while the switch is held in.  Once you 
>let go, the power stops thru the switch, since the mb is activating a relay 
>to keep the power going.  Paul Hachmeyer
>
> William Slater wrote:
>
>> Any suggestions greatly appreciated,
>>     build background info, mb ASUS M2N SLI delux, AMD Athlon 64 cpu 
>> windsor
>> 2.4 ghtz, power COOLMAX 700w, case THERMALTAKE Armor, hd 320gb seagate 
>> sata,
>> 160 gb maxtor ide, plextor dvd ide, gaphics Geforce 8600 GTS 256, mem OCZ
>> platinum 2gb DDR2 800,
>> tech level intermediate-advanced...use win xp and linux Ubuntu, Fedora,
>> Suse..able to partition hard drive ect ...but not able to write code
>> read Asus manual 4+ times before attempting build.
>>
>> Objective situation-. plugged in rear switch on green light visible on in
>> case, press start button 0.5 seconds rear fan and cpu cooler fan come
>> on...then immediately off, dvd led also comes on and on other led by pwr
>> button..I double checked the internal connections, system panel connector
>> pwr ground,ide led reset,4 pin spker, system pwr led , sys spkr, appears 
>> to
>> be correct
>> not sure if on-off  switch is good or not
>>
>> any suggestions welcomed
>>
>> William Slater
>> [log in to unmask]
>> also stjncross  at gmail instant messenger
>>
>
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