Re: New PC build will not post or give video output

You've already tried all the more common obvious items. so it time to try
some of the more remote possibilities...

Each new system I build, I first start out with all the basic components
outside the case, sitting on the bench.

start with just the MB, the CPU/HSF, the ram. a known video board & monitor,
and if need be, a small speaker you can attach to the MB itself to listen
for error beeps.

Fire it up by either manually shorting out the pins on the MB that normally
go to the front panel power switch, or by using a power button from an old
case.

If the video displays on the monitor check to see it counts the right amount
of memory and CPU.

Only if I get that far do I proceed to mount the MB in the case.

I mention this because it's 'possible' although not as likely with todays
MB's as it was with older MB's that where the MB mounting posts meet the MB,
older MB's required you to use a small insulating washer on at least a few
of the studs so the stud wouldn't short out some paths near the hole on the
MB.

Modern MB's are usually designed such that the insulating washers are no
longer needed and in some case must NOT be used.

It's 'possible' that you installed one of the MB standoffs in the wrong
position in the case, and instead of it aligning with the mouinting hole,
it's touching somewhere else on the MB causing your problem.


"Martin C" <MartinC@xxxxxxxxxxx> wrote in message
news:hjAXf.1604$Rm1.607@xxxxxxxxxxxxxxxxxxxxxxx
Wow! Thanks for the rapid responses. I was just about to add some extra
details that I had originally missed off.

The power and reset switches work ok.
The power starts up each of the fans I have - CPU, Case fan, Northbridge
fan, Graphics card fan. The PSU fans work as well.
The PCI-Express power connector is plugged into the graphics card directly
from the PSU.
The Led on the front of the case lights up when the power switch is
pressed
and the led on the motherboard lights when the PSU is on.

I have checked, and the motherboard is not touching the case anywhere.

Thanks for the responses, but unfortunately, they were not the problem.
Any
further ideas.

Martin



"beenthere" <Waiting@xxxxxxxx> wrote in message
news:dCzXf.27811$Nh7.10616@xxxxxxxxxxxxxxxxxxxxxxx

"Martin C" <MartinC@xxxxxxxxxxx> wrote in message
news:gczXf.1568$Rm1.927@xxxxxxxxxxxxxxxxxxxxxxx
I have finally put together a brand new PC build using the following
components

Antec TX640B case with Antec 400W SmartPower PSU
ASUS A8N5X motherboard
AMD Athlon 64 3500 processor
1GB Corsair TwinX 3200 DDR RAM (2x512MB matched)
200GB Seagate Barracuda SATA HDD
Floppy Disc drive
Lite-On DVD RW
Leadtek GeForce 6800GS PCI-Express video card

When I try to power up the PC, I get no POST and nothing appears on the
screen.
The keyboard lights flash briefly when I turn on the Antec power supply
itself (the switch at the back of the PC on the PSU), but they do not
flash
when I turn on the PC itself.

I have tried the following so far:
a) All unnecessary devices have been unplugged completely (Floppy, HDD,
DVD) - problem persists
b) Disconnected the keyboard - expecting to receive an error - still no
POST
or display.
c) Have reseated and reconnected the video card repeated - problem
persists.
d) Have reset the CMOS - no change.
e) Have taken out one of the DIMM sticks and have tried swapping them
as
well. No change.

I assume this means that the memory is probably ok.

The box in which the graphics card came states that it needs a 350W
minimum
PSU, so my 400W Antec should be ok.

If the graphics card is broken, would I still get a POST bleep? I have
checked the speaker lead in the case and it seems ok. Yet I have yet to
hear
any sort of bleep from the speaker, so I don't know if it is trying to
tell
me something, but I can't hear it, or not.

Unfortunately, as this is a completely new build, there is nothing in
my
old
PC that I can use to replace to try things out (it really was an old
PC).

If anyone can help me out with this, I will be so grateful as I have
run
out
of ideas other than trying to send back each component separately until
I
can get something to work. That works out expensive in postage and time
consuming.

What is more likely to be at fault here, PSU, CPU, Graphics card or
something else?

TIA
Martin

On top of what you`ve already been told.
Make sure the Mboard isn`t touching down on the case !
Is the Grfx card powered ?.






.

Relevant Pages

  • Re: Reasons Not To Power A TFT From PC PSU?
    ... brick power supplies are generally pretty unsophisticated. ... Then I held a Delta 8cm fan to the barrel to see ... Dug out my AT PSU and chopped the wire and barrel off an old brick I'll ... Sorted the cabling by digging out a couple of short wires removed from a fan ...
    (uk.comp.homebuilt)
  • Re: Reasons Not To Power A TFT From PC PSU?
    ... brick power supplies are generally pretty unsophisticated. ... Then I held a Delta 8cm fan to the barrel to see ... Dug out my AT PSU and chopped the wire and barrel off an old brick I'll ... to test I had the polarity right (the wires are both white!) and marked ...
    (uk.comp.homebuilt)
  • Re: Dead eMac
    ... a couple of seconds later the fan comes on and about ... Sounds like something has gone and it is taking to much power, ... (and if I follow your train of thought stick a std monitor on there). ... So PSU problems you think? ...
    (uk.comp.sys.mac)
  • Re: PSU problem?
    ... lamp at the side is defective, and occasionally when the desk moved I.E. ... and the fan seems to be steady and quiet now. ... If the PSU drew so much power ... >> I currently suspect the PSU at present, ...
    (alt.sys.pc-clone.dell)
  • Re: PSU problem?
    ... system file checker. ... and the fan seems to be steady and quiet now. ... If the PSU drew so much power ... >>> I currently suspect the PSU at present, ...
    (alt.sys.pc-clone.dell)