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Intermittent boot


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#1 BAR-0

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Posted 30 June 2010 - 12:35 PM

Four year old Gateway 3250S with XP/home. Problem is that computer won't boot and 4-wire cabinet fan comes on in hi-speed mode when computer is turned on. During normal start (when it does) fan comes on at low speed and then goes to hi-speed later after running for some time. Flexing the cpu fan tower, which also slightly flexes the motherboard, allows it to start.
Once properly booted it will run all day without problem.
I suspect this is a solder problem but don't have a clue where to look. Once booted, flexing as above does not cause further malfunction so my usual troubleshooting techniques can't be used.
Any and all thoughts and ideas will be greatly appreciated.
Thanks
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#2 MrBruce1959

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Posted 30 June 2010 - 04:30 PM

Hello and welcome to Bleepingcomputer.

I have heard about and also seen your problem before.

Usually, but not always it is fixed by a simple unplugging and replugging plugs or expansion cards.

Sometimes flexing makes a connection happen that is failing do to the following: Loose plugs, corrosion build up on a connection, loose expansion cards, corrosion on the contacts on RAM/slots or slots where expansion cards are placed.

Oxidation is from a chemical reaction caused by a mixture of Oxygen, moisture and the differences between two unlike metals mated together by compression.

The object is to disturb this oxidation by making the two surfaces rub against each other, or by using a device such as a toothbrush to run the bristles through the slot, across the connectors and across the contacts to remove the white powder.

Remember those old ZIF Nintendo game consoles that required that special cleaning tool? That was Nintendo's biggest mistake was using ZIF connections between hardware and now they use DVD disks instead.

Sorry for the lecture, but I like to back up any theory I use here on Bleepingcomputer. :thumbsup:

So I would recheck all connections through out your motherboard and computer case, not only make sure they are secure, but also replug any or all connections where two metals mate to make a connection.
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