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Thread: Weird PSU symptoms
Started 1 month, 1 week ago by iPowerUser
Hey fellow geeks - I recently just did some hardware modifications to an old Windows XP box to setup as a machine for me to get some hands on practice with for my MCDST exam. It's about 3 years old, an HP Desktop with 512MB of RAM, 120GB HD, 2.60ghz Pentium 4 processor, etc. I opened it up and added an additional 512MB of RAM, added ...
Site: Geeks to Go! (Free Computer Help)  Geeks to Go! (Free Computer Help) - site profile
Forum: Hardware, Components and Peripherals  Hardware, Components and Peripherals - forum profile
Total authors: 3 authors
Total thread posts: 12 posts
Thread activity: no new posts during last week
Domain info for: geekstogo.com

Other posts in this thread:

Neil Jones replied 1 month, 1 week ago
Bearing in mind the most strenuous part of being a PSU is the initial power-up sequence from a cold start, and hard drives suck up most of this getting started, it's perfectly possible the PSU now can't provide enough juice to get everything going. Those HP ones tend to be Bestec with low wattage output, but it's worth replacing just by virtue of the ...
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iPowerUser replied 1 month, 1 week ago
I was trying to avoid spending any money on this practice junk box, but I guess that's going to have to be necessary Neil. I just threw some spare parts in and hoped for the best. However, I did leave the PSU plugged in overnight so it could try and hold some voltage.. only to turn the box on this morning and have it do the same thing. I think the low ...
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iPowerUser replied 1 month, 1 week ago
Just added a brand new 400 Watt PSU to the desktop and nothing is turning on, not even the new PSU. Anyone have any ideas?
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rshaffer61 replied 1 month, 1 week ago
IS the outlet live? The connections to the mobo correct? IS the switch on the front connected tot he MOBO correctly? Have you tried to do the following? Disconnect everything from the Motherboard except keyboard mouse video output 20+4 powercable 4/8 pin 12v wire both coming from the powersupply, Cpu fan wire power and reset button to the ...
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iPowerUser replied 1 month, 1 week ago
Hi and thanks for your help! The outlet is live, I know this because the LED on the back of the power supply lights up. However, nothing inside the box seems like it's responding. I tried with both a brand new PSU and the existing PSU source. As far as I could tell, the configuration inside the desktop was connected correctly, but there's always room ...
Size: 1,273 bytes
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rshaffer61 replied 1 month, 1 week ago
It is beginning to sound like a bad MOBO. I would triple check that switch connection to the MOBO from the front of the case. Did you disconnect the 320 gig hd? Try taking out one stick of memory or put old memory back in.
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iPowerUser replied 1 month, 1 week ago
I removed the new memory stick, leaving the remaining 256MB sticks that originally came with the box. Each stick is in a blue slot parallel to an empty black slot. The only other switch connection in the vicinity on the mobo says "FRONT USB1" and "FRONT USB2", so it obviously couldn't be those two since there are two USB 2.0 ports on the front of the box...
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rshaffer61 replied 1 month, 1 week ago
The other option is to take the MOBO out and do a bench test. If it fails to start then we can only determine that the board has died. Remove the motherboard from the computer along with the power supply place the motherboard on a piece of card board larger than the motherboard, this will eliminate a short from the mobo to the case which could be a ...
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iPowerUser replied 1 month, 1 week ago
Having issues removing the motherboard from the chassis. The 120GB is also blocked. I can't access the other side of the box as it's also blocked off. The last few screws are hiding behind and under some metal insulation as pictured. Any suggestions? Attached thumbnail(s)...
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rshaffer61 replied 1 month, 1 week ago
Looking, give me a little bit to look this all over.
Size: 322 bytes
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Top contributing authors

Name
Posts
iPowerUser
7
user's latest post:
Weird PSU symptoms
Published (2009-11-16 15:02:00)
No problem.. it's an HP m376n box. It's an old junk box, so I kind of expected to run into some bad engineering. UPDATE: Plugged the old PSU into a different mobo and the mobo LED lights up. Had to use a different power/reset switch, still wouldn't boot. Then used new PSU into different mobo with power/reset switch, no LED lights up and also wouldn't boot. Strange. This post has been edited by iPowerUser : Today, 04:03 PM
rshaffer61
4
user's latest post:
Weird PSU symptoms
Published (2009-11-16 14:59:00)
Looking, give me a little bit to look this all over.
Neil Jones
1
user's latest post:
Weird PSU symptoms
Published (2009-11-15 18:06:00)
Bearing in mind the most strenuous part of being a PSU is the initial power-up sequence from a cold start, and hard drives suck up most of this getting started, it's perfectly possible the PSU now can't provide enough juice to get everything going. Those HP ones tend to be Bestec with low wattage output, but it's worth replacing just by virtue of the fact that's a Bestec, they tend to go bang rather spectacularly after...

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