|That the one thing that is doing my head in. NO IBM Beeps. Started testing in case. Moved to bench, moved back to case. |
PSU, MB, HS/FAn, CPU, That's it, no RAM, HDD, FDD, CDROM etc.
NO BEEPS. Fan spins up.
A 110 Watt PSU should be able to work MB, HS/FAn, CPU. Feeling around the board. All dead cold. There are two small HS over two small chips, whis should get some heat when power is feed through them. But Cold as metal is cold.
Leaving the Yellow/Black cable off. Fitting this cable, the system will not fire up. Dead.
I'm still convinced that these MD are no more, had it. But, I'm not convinced that the PSU is OK. But both the PSU's I have, the 110W and the 400W + the 500W in the system I'm writing this on, all work this system. OK, with the 110W, I did however remove all but one drive and all DVD-ROMS. No FDD any way.
But something tells me that the 400W PSU is flaky.
Poat #1, I said the the PC would shut down for no reason, when it felt like it. Reboot and she is fine for 24 hours or so, then shuts down again. Did this about 6 times over 7 days. Then gave up completely, and has not worked since.
I have bought a new MB with CPU, Ram just waiting for it to arrive. But, wanted to be 100% sure, that this PSU will not damage it. All the teats I have done, say that the PSU is fine. Below is how I carried out the test:-
To test an ATX PSU:
First, disconnect everything from the power supply (including MB.) Plug
AC cord into the rear of the PS. IF the PS has its own rocker on/off
switch, turn it ON. There should be +5v on pin 9 of the 20 pin connector
(+5vsb, usually a violet wire.) There should be >0.8v on pin 14 (PS-ON,
usually a green wire.) This is from an internal pull-up to the +5vsb.
Connect PS power leads to 1 or 2 IDE HDs (for a load). Jumper pin 14
(PS-ON) to pin 13 (ground, black wire.) At this point, fan in PS should
start spinning, drives should spin, and + 5/12v, -5/12v, +3.3v, and
+5vsb should be present at 20 pin connector.
Disconnecting pin 14-13 jumper should turn supply back off.
When your system fails to start, what is the voltage on pin 9? If it is
less than 4.75v, either a) the logic on your motherboard is shorting
b) your +5vsb is under powered, or c) your PS is bad. It is
most likely a combination of b) and c).
If your +5vsb is OK, measure pin 14 of the PS/MB connector. If it is <0.8v
(and the +5vsb is OK), the power supply should be on. If pin 14 is <0.8v,
the +5vsb is OK, and the PS is OFF, the PS is bad. If pin 14 is >2.0v, the
power supply is being told to stay OFF by the MB. If depressing the front
panel ON/OFF switch does NOT lower pin 14 to <0.8v (and the +5vsb is OK),
then the problem is NOT the power supply, but rather MB related.
I would go out tomorrow and buy a new PSU, But not knowing why this has happened is a pain. I must say thanks Otherhill for you time here. BTW, whats your name? Cheers, Andy