pc won't boot any more - 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 08-18-2005, 07:36 AM   #1 (permalink)
Newb Techie
Join Date: Aug 2005
Posts: 1
Default pc won't boot any more

Hi all,
I built a brand new PC about 2 months ago. It ran without any problems so far. Today, I told Windows XP to turn of the computer, which it did. A bit later I tried to switch the PC back on again, but it wouldn't boot - no fan noise from the power supply or any of the other fans, everything black.

I opened the machine and found the following:
- the power LED on the mainboard is on when power is connected (this is a small status indicator LED on the mainboard that shows that standby voltage is present
- trying to bridge the Powerswitch Jumper on the mainboard with a screwdriver doesn't work
- briding PIN 14 and PIN 15 directly on the ATX plug works, the fans start to spin (cpu cooler as well) and the speaker peeps
- the system won't switch on, even when all harddrives, ram and cards have been removed
- PIN 9 (Standby Voltage) measured with a voltmeter shows 3 Volts, not 5V
- there is not smell of burnt plastic

I admit that the power supply is a rather cheap and nasty one, it's also a ATX1 supply, whereas the mainboard has got a connector for an ATX2 supply (the 4 extra pins, that make the ATX2 plug longer)

Since I built the machine myself I need to be able to correctly identify the broken component before I can bring it back to the retailer.
Does anyone know whether it's more likely that the mainboard is broken or whether the powersupply is broken (despite that fact that it seem to deliver power, albeit 3V instead of 5V on standby voltage).

Thank you for your help.


chemoul is offline  
Old 08-18-2005, 07:46 AM   #2 (permalink)
Ultra Techie
Join Date: Jul 2005
Posts: 813

Kindof hard to tell which one is causing the problem. All I can say is it's a lot easier to swap out your power supply than your motherboard. Do you know someone with a pc that will let you borrow their power supply and test it on your system? That's what i would do.

I know that didn't answer your question, but that's all I can really offer.

Associates Degree in IS

A+ Certified

Studying for Network+
BASSMASTER is offline  
Old 08-18-2005, 07:53 AM   #3 (permalink)
Newb Techie
Join Date: Jun 2005
Posts: 10

If you have a multi-metre lying around and you know how to test the power, this is the most effective way to see if it is your PSU. If not then what BASSMASTER said is your best option.
smitherz 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

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 01:59 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.