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PC will not power on

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October 8, 2012 5:43:03 PM

Hello,
I have a Dell Studio 540 tower. It does not power on. I replaced the power supply and the mobo with the same previous mobo (new). The green led light on the back of the power supply stays on. When I press the power button, the led blinks then remains on. Any ideas???? Should I replace the power switch? Sooooo Lost! All my synth software & hardware has taken weeks to tweek.
Thank You,
Frankie

More about : power

a b ) Power supply
October 8, 2012 6:02:31 PM

Post your full specs for assistance. Suggest you try 'Breadboard' technique, where you dismantle whole system and place the mobo on a (dry) breadboard and build it up a bit at a time.Start with just psu,1stick RAM, CPU and connect monitor to integrated GPU if you have one (if not, try your GPU in a mate's PC...) You can start your rig by shorting out the two pins marked Pwr on your front panel connector using a small flat blade screwdriver. If it runs on the breadboard add rest of RAM, drives etc. if that is successful look for a possible short cct...
October 8, 2012 6:37:12 PM

Thanks Dodger46,
Specs: pentium 4 3.2 ghz
intel mobo DELL M0176
nvidia 9800gt graphics card
8 gb ram
Related resources
October 8, 2012 6:45:39 PM

u can try go in behind the power switch and bridge it
October 8, 2012 6:47:29 PM

Hey Darrren0000, I pulled the power switch out and trying to btridge it with a paper clip. Not sure if I am bridging it correctly.
a b ) Power supply
October 8, 2012 6:52:30 PM

All the pwr switch does is short out the two pins on the Front Panel connector block, so if you bridged them and it still doesn't power up there's something amiss... plus the LED blinking tells me the pwr sw is probably working...
a b ) Power supply
October 8, 2012 6:57:09 PM

I se you mobo has onbard GPU, try connecting your monitor to that to see if it works...
October 8, 2012 7:00:07 PM

have a double check of the wires go to the board like, pwrsw,led etc make sure there in the right pins
October 8, 2012 7:02:21 PM

on the power swith gone to the board make sure when u plug it in that the black is going to negative and the red is going to positive
a b ) Power supply
October 8, 2012 7:03:12 PM

+1 darren, beat me to it! Would certainly explain a lot if in wrong place!
October 8, 2012 7:04:36 PM

would explaim maybe why it shorts when he bridges it lol
October 8, 2012 7:06:26 PM

sometimes they still work tho if bk to front :) 
a b ) Power supply
October 8, 2012 7:09:48 PM

Pwr lead would as it's only a temporary short cct
October 8, 2012 7:12:13 PM

no news is good news lol
a b ) Power supply
October 8, 2012 7:14:30 PM

darren0000 said:
no news is good news lol

Probably playing a game...
October 8, 2012 7:16:08 PM

love it lol
a b ) Power supply
October 8, 2012 7:18:36 PM

i would start by seeing if a card has failed and is shorting out your pc. bare bone the pc. one ram stick. unplug all the drives and removed all the cards from the mb and see if the mb will post. if you get the same no power issue and it a new mb..it may be the cpu or a dead short. to see if it a dead short i would take the ps and mb and see if they post outside the case. (one thing to check is see if there a screw or anything under the mb that could short the mb out.)
October 8, 2012 7:22:57 PM

smorizio said:
i would start by seeing if a card has failed and is shorting out your pc. bare bone the pc. one ram stick. unplug all the drives and removed all the cards from the mb and see if the mb will post. if you get the same no power issue and it a new mb..it may be the cpu or a dead short. to see if it a dead short i would take the ps and mb and see if they post outside the case. (one thing to check is see if there a screw or anything under the mb that could short the mb out.)


i dont think this is necessary as no fans even turn so either the leads are pinned wrong, dead psu, or dead motherboard
October 8, 2012 7:27:02 PM

soz didnt notice its a new psu and board lol
October 8, 2012 7:43:01 PM

must plug the psu into the cpu and repower
October 8, 2012 7:52:54 PM

darren0000 said:
no news is good news lol

Not time for video games here, lol!!!
I had to pick up the kids from school......then dinner.....then home. So, I tried the clip bridge thing. Funny result, Noe the front blue led light that illuminates the power button stays on! WTF,
You guys, gals are great!!!
I wil be home in 4 hours and then the troubleshooting will continue.
Thanks to all of you,
Frankie
October 8, 2012 7:54:42 PM

dodger46 said:
I se you mobo has onbard GPU, try connecting your monitor to that to see if it works...

I will try that later, thanks
October 8, 2012 8:03:09 PM

darren0000 said:
on the power swith gone to the board make sure when u plug it in that the black is going to negative and the red is going to positive

ALL GOOD, BLAck to negative, Red to positive, lol. It only plugs in one way, idiot proof
October 8, 2012 8:07:55 PM

my doesnt mine are a row of pis, beside those pins its marked with whtever swith applies with - and + so if i turn the connector and plug it in it will be reversed positive to negative and negative to positive which will then short against itself
October 8, 2012 8:28:00 PM

paulmcdowell said:
must plug the psu into the cpu and repower


LOL
!