Power On Issue - Techist - Tech Forum

Go Back   Techist - Tech Forum > Computer Hardware > Hardware Repairs and Troubleshooting
Click Here to Login
Closed Thread
 
Thread Tools Display Modes
 
Old 10-25-2008, 04:06 PM   #1 (permalink)
Newb Techie
 
Join Date: Oct 2008
Posts: 3
Default Power On Issue

So I recently built a new machine for my brother. He's been using it for about a month now and had no problems up until now. Now it's not powering up. So, I reseated everything with the exception of the processor and cpu fan. The Power LED light on the motherboard is coming on. I asked him what he did last time he had it on hardware wise and the only thing he mentioned was disconnecting a USB Headset on the front panel where the power switch is. So I thought maybe it could have been a bad power switch so I took a screw driver and tried to manually jump start the motherboard without any luck. I'm now completely out of ideas on what else to look for.. any suggestions would be deeply appreciated.

Specs: 9800 GeForce GXT, Intel DP35DPM Socket 775 Motherboard, OCZ 600W Stealth Xtreme Power Supply, 2x 2048 MB PC6400 DD2 800 MHZ RAM, NZXT Apollo Blk ATX Mid-Tower Case w/Clear Side
__________________

Hessinger is offline  
Old 10-25-2008, 04:28 PM   #2 (permalink)
Master Techie
 
Alvin.C's Avatar
 
Join Date: Jun 2004
Location: United Kingdom
Posts: 2,580
Default Re: Power On Issue

Hello,

Have you tried resetting the BIOS?

Also, try disconnecting all unnecessary hardware from the motherboard (such as the hard drive, CD-ROM drive, mouse, keyboard, additional RAM modules and motherboard header attachments such as a USB or audio header) and try powering to see if it will POST. If you've got onboard graphics, you could also remove the dedicated graphics card, plug the monitor up to onboard graphics and see if it will POST (reset the BIOS after removing the dedicated graphics card).
__________________

__________________
Alvin.C
linkedin.com/in/alvinwkchan

|Gaming PC| |Dell Latitude E7250| |Macbook Air 13" (Mid 2013)|
|Windows 10 Pro (x64)| |Intel Core i5-6600 @ 3.3 GHz| |MSI NVIDIA GeForce GTX 1080 Gaming X| |Noctua NH-D15S CPU Cooler| |Gigabyte GA-Z170MX-GAMING 5 mATX Motherboard| |Samsung 840 Pro 256GB SSD| |Corsair Vengeance LPX 16GB DDR4-SDRAM| |OCZ ModXStream Pro 700W Modular PSU| |NZXT Vulcan Micro ATX Case|
Alvin.C is offline  
Old 10-25-2008, 05:17 PM   #3 (permalink)
Newb Techie
 
Join Date: Oct 2008
Posts: 3
Default Re: Power On Issue

Quote:
Originally Posted by Alvin.C View Post
Hello,

Have you tried resetting the BIOS?

Also, try disconnecting all unnecessary hardware from the motherboard (such as the hard drive, CD-ROM drive, mouse, keyboard, additional RAM modules and motherboard header attachments such as a USB or audio header) and try powering to see if it will POST. If you've got onboard graphics, you could also remove the dedicated graphics card, plug the monitor up to onboard graphics and see if it will POST (reset the BIOS after removing the dedicated graphics card).
Thanks for the suggestion. However it did not help. I've now extensively tested the power supply as well and it works perfectly fine. When I turn the power supply on, the power LEDs across the motherboard do come on. However, the power button does not do anything, nor do the fans come on. I also tried removing all unnecessary components from the machine including all the USB and Audio Headers. I still have a feeling that its the power button switch. Let me explain what I have tried to do to rule this out and see if this idea even makes sense. From the little understanding I have of hardware, I believe the power button is nothing more then a momentary contact switch. So I took a Flathead and just put them over the 2 Power Pins, but nothing happens. Someone let me know if my logic is flawed on that. Also any other suggestions would still be helpful.
Hessinger is offline  
Old 10-25-2008, 06:13 PM   #4 (permalink)
Master Techie
 
Alvin.C's Avatar
 
Join Date: Jun 2004
Location: United Kingdom
Posts: 2,580
Default Re: Power On Issue

Quote:
Originally Posted by Hessinger View Post
Thanks for the suggestion. However it did not help. I've now extensively tested the power supply as well and it works perfectly fine. When I turn the power supply on, the power LEDs across the motherboard do come on. However, the power button does not do anything, nor do the fans come on. I also tried removing all unnecessary components from the machine including all the USB and Audio Headers. I still have a feeling that its the power button switch. Let me explain what I have tried to do to rule this out and see if this idea even makes sense. From the little understanding I have of hardware, I believe the power button is nothing more then a momentary contact switch. So I took a Flathead and just put them over the 2 Power Pins, but nothing happens. Someone let me know if my logic is flawed on that. Also any other suggestions would still be helpful.
Hello,

No your logic is correct. As long as you're shorting the correct pins, it should turn on:



If you haven't tried removing and re-installing the processor, it's worth a try. Remember that each time the heatsink is removed from the CPU, the thermal interface material should be cleaned off from both surfaces and a fresh layer applied before re-installing.

However, before you remove the CPU and heatsink, try removing everything from inside the PC case (including the motherboard), re-connect everything outside the case, and see if the system will power on. The reason for this is because the motherboard may be grounded to metal inside the chassis causing it to not turn on.

An example of testing a system outside of the chasis:
__________________
Alvin.C
linkedin.com/in/alvinwkchan

|Gaming PC| |Dell Latitude E7250| |Macbook Air 13" (Mid 2013)|
|Windows 10 Pro (x64)| |Intel Core i5-6600 @ 3.3 GHz| |MSI NVIDIA GeForce GTX 1080 Gaming X| |Noctua NH-D15S CPU Cooler| |Gigabyte GA-Z170MX-GAMING 5 mATX Motherboard| |Samsung 840 Pro 256GB SSD| |Corsair Vengeance LPX 16GB DDR4-SDRAM| |OCZ ModXStream Pro 700W Modular PSU| |NZXT Vulcan Micro ATX Case|
Alvin.C is offline  
Old 10-26-2008, 01:14 AM   #5 (permalink)
Newb Techie
 
Join Date: Oct 2008
Posts: 3
Default Re: Power On Issue

I was def. shorting the correct pins. Ill try the outside system test in the morning. Thanks again! I will update here with some confirmation later.
Hessinger is offline  
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Old Power supply Guide (2008) Ste New Systems | Building and Buying 223 12-12-2009 09:05 PM
POST Troubleshooting Guide SYL\X/3K Hardware Repairs and Troubleshooting 7 03-07-2009 11:24 AM
What To Look For When Buying Computer Components Luke Monitors, Printers and Peripherals 25 01-07-2009 09:09 PM
Disconnect power to start pc....uh? Ithinkso Hardware Repairs and Troubleshooting 8 07-27-2008 08:06 AM
Help with my PSU! weezerguy187 New Systems | Building and Buying 22 01-27-2008 04:58 PM



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 08:23 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.