Won't power up- changed PSU- still won't power up _ Help please including personal safety issue . sb

Davbaron

Member
Sep 3, 2000
83
0
0
I have changed my PSU from a 235 w to this new one. The reason i did it was that ,
after a sudden close down when playing a flight sim, I switched on afain and nothing
happened POST wise, all I got was nothing on the monitor. But the CPU fan worked
and so did the switch lights, but that was all. I suspected the Power_good signal
wasn?t getting thru( having read Scott mueller?s book on PC?s and so ordered a
replacement PSU, as I thought mine was going on the blink.
On one occasion, the PC did boot up and I thought all was Ok , but some two days
later it suddenly went off, again, in the middle of a flight sim.
The new PSU I got was the Enermax 365P - VD. I wernt to fit it today and still a
problem as below.
It has a power fan connector lead.Two wire, black and white, which I have not
connected as i think it only monitors the PSU fan(s)
I have a MS 6340 Ver 1 mobo. It is fitted with a AMD Thunderbird 1000 processor.
I have fitted the plugs of the PSU the same as when they came out of the system and
they are;
1. The twenty pin (Pl) plug which goes into the motherboard.
No other plug was taken out of the motherboard when i disconnected the PSU.
2. The peripheral connectors to Hard drive; CDRom; CD Writer; (4 pin )
3. The floppy connector.(4 pin )
There are two other sorts of plug which I haven?t connected to anything. In the PSU
manual they are described as
a) Aux power connector (Pentium4 )
b) +12v Power connector (Pentium 4 )
In view of the (Pentium 4 ) after their description , I presume they are only applicable
if i had a pentium 4 processor and therefore a pentium 4 motherboard.
I cannot see what else I need to plug in. So, I switched on .
The switch light comes on.
The CPU fan goes round ,
There are three bleeps; then three more bleeps; then three more bleeps and so it goes
on. Can someone confirm that this is a Post Audio Error code. If so, what is
indicated?
My BIOS , according to the round disc on the motherboard says 686
AMIBIOS
c1999
AK87
2796

I hit the switch to turn off , but nothing happens, The switch stays on, the bleeps keep
going.
Should I suspect the switch?
If so. how do I get to it.

THE SECOND IMPORTANT QUESTION IS.

If I disconnect the PSU from the mains electricity, but leave it in the computer, will I be at risk from electrocution from it if I work on the switch terminals?

I say this because of a paragraph in Scott mueller's book "Upgrading and repairing PCs". I will quote the paragraph,

"Caution - The remote power switch leads carry 110v AC current at all times. You could be electrocuted if you touch the ends of these wires with the power supply plugged in. Always make sure the power supply is unplugged before connecting or disconnecting the remote power switch".

Please reply as soon as abl;e, esp[ecially to the safety question- Thank you.




.
Help would be appreciated please
Thanks


 

ojai00

Diamond Member
Sep 29, 2001
3,291
1
81
Beep codes usually have something to do with the hardware, specifically your video card or your memory. I would consult my manual to see what they stand for. Most of the common beep codes are documented in the manual. Having the fans and the lights come on, but nothing else, usually indicates a bad power supply, but it could also indicate a burnt out CPU or motherboard. Have you tried testing the processor in another motherboard? Good luck.
 

cleverhandle

Diamond Member
Dec 17, 2001
3,566
3
81
From your description (especially the one good boot) and the info here, I would guess you've got some bad RAM. Try using only one stick if you've got more than one, or get some known good RAM from a friend. Doesn't sound like power to me - and, personally, I wouldn't mess with the innards of PSU before consulting my EE buddy.
 

Davbaron

Member
Sep 3, 2000
83
0
0
Thanks for the replies so far.
Cleverhandle - I couldn't get the link you gave ?? Also , I'm sorry i didn't make it clear. I don' t intend to go inside the power supply unit - What I intend to do is look at the On/Off switch on the case and the leads which go to that ( presumably from the PSU ) . Seems there might be enough "Kick" in the PSU to be nasty? Or haveI got that wrong??
 

MadRat

Lifer
Oct 14, 1999
11,965
278
126
Some ATX powersupplies require you to hold in the power button for 5-seconds to initiate the first powerup.