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Computer That Turns On and Then Off before boot or beep

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3 replies to this topic

#1 rugone


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Posted 02 November 2014 - 01:18 AM

win 7 pro, intel proc, checked power supply - OK, boot hard drive iffy, changed cmos battery, checked visually for shorts.

Comp starts to power and shuts after 5 sec, and repeats.Tried to boot with all periferals disconnected. No good.

Edited by hamluis, 03 November 2014 - 10:14 AM.
Moved from Win 7 to Internal Hardware - Hamluis.

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#2 ElfBane


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Posted 02 November 2014 - 04:17 AM

Welcome to BC!


You need to start isolating the MB from connected peripherals... disconnect any ODs, memory card readers, USB boards, etc, from the MB. Then see if it boots up. If that is No Joy, then selectively start removing RAM and/or changing the slots they plugin to. See if it boots up. If that is No Joy, then you will have to get serious, you will need to "breadboard" your system.

Here is a video on BBing ... http://www.youtube.com/watch?v=aEP3OLZvMm0


But I do suspect the MB/CPU has died.


Ground yourself momentarily to the chassis before working inside a PC case. BE CAREFUL, there are voltages that can injure you when working on electronics.


Let us know.


Edited by ElfBane, 02 November 2014 - 04:19 AM.

#3 hamluis



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Posted 02 November 2014 - 12:26 PM

Just curious...how did you check the PSU if system shuts off after minimum seconds?



#4 rugone

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Posted 02 November 2014 - 09:52 PM

Have a brand new PS,  disconected all old and plugged the new leads.  Also checked voltages on both the old and new ps on all the pin stes.


Will try the elfbane suggestions for isolating periferals to MB Already reseated memory and all boards


Hoping for the best..... will keep you posted

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