PC completely dead - confusing!!

July 3, 2009 at 09:11:24
Specs: Windows XP
Hope someone can help with this as it’s starting to drive me crazy – it’s a long story but I want to give as much info as I can..
I had a working bog standard AMD Duron (1.6ghz) running XP, which I decided to upgrade to a 2.8Ghz P4 (second hand) – also bought a new case to put the bits in (fitted with a 450w psu).
Before I got the case I put all the 2.8ghz bits inside the old case – things seemed to work ok, except for the GPU fan rubbing on the heatsink (when the case was placed horizontally the noise stopped – but I later found out that this was because the fan also stopped – but this is a side issue at the moment.
So, the 2.8ghz bits (as well as the older Duron bits) booted up inside the old case – which is a good point to remember.
The new case arrived & I put the 2.8ghz bits inside it – the cpu fan spun & the speaker constantly emitted 8 short beeps (apparently this is something to do with video buffers/chips – this could be related to the fan rubbing/stopping scenario above – but this isn’t the main issue.), but nothing else happens, no bios bootup or display on screen.
Knocked it down to bare minimum & still no luck.
Then thought i’d try the old duron in the new case – this was even worse, nothing at all happened, not even the cpu fan spun.
Then I tried the old duron in it’s original case (ie to get back to where i’d started from, so at least I could have a working PC).
Still nothing – exactly the same fault.
To recap - Have tried both motherboards in the new case, duron MB acts completely dead, whilst 2.8ghz MB just spins the CPU fan & emits 8 beeps.
Then putting original system (ie duron) back together in original case – system is completely dead.
Help, I think i’m going mad!!

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July 3, 2009 at 09:35:45
1 of your standoffs is shorting out or not grounding properly. Look at all your mounting points. Solder around the opening on the mb usually means a metal mount goes underneath it. An opening without solder usually means a plastic mount goes under it.

WinXp Amd 64 3000 Msi Neo2 Platinuim 1 gig ddr 400. When we cast a pebble into a pond we should look past the first ripple.

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July 3, 2009 at 09:42:09
The duron system doesn't have standoffs, just raised holes.

The new case came with standoffs.

However, I tried powering up both motherboards without them being inside the case.

The 2.8ghz MB powered up, cpu fan spun, but nothing else.

The duron system did nothing at all - even in the case it came out of.

What else could it be?

(as a by the way should the system work if the MB isn't mounted inside the case - or does it need screing in to be grounded?)

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July 3, 2009 at 09:48:41
Why are repeatedly calling your CPU bits?

I agree that you may have a standoff in the wrong place. However, I haven't seen a board in years that required nylon standoffs. If there is a screw hole IN THE MOTHERBOARD then you can use a metal standoff. Problems arise when you insert standoffs in every hole in the case. You need to hold the board up in the case a figure where you need to place standoffs.

Some cheap cases don't require standoffs and have a raised boss in every possible screw location.

Those can present problems because the boss can be too large and short out or there may be a boss where you don't place a screw. In that case, you may need to fit fiber washers between the board and the boss.

Best not to even buy that type of case.

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July 3, 2009 at 10:00:06
Sorry, when I refer to the '2.8ghz bits' I'm meaning the parts that go together in a particular case (ie the processor & its equivalent MB) - it's just so that I can distinguish between the 2 systems.

I take your point about the standoffs but why should the original duron MB & proc, when put back into its original case (the one with the raised holes, not standoffs) be completely dead?

Even if the upgrade parts weren't working properly I would have hoped to be able to but the original stsem back together - but now even that doesn't work.

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July 3, 2009 at 10:20:05
What happens if you boot the 2.8GHz P4 system without a video card? Is the beep code different?

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July 3, 2009 at 10:52:03
I don't think i've tried that - i'll have to give it a go.

I was more concerned in getting the original PC back in one piece & working again.

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