Unplugging monitor lets pc bootup!

[musicman53]

New build for a mate....
Booted up first time no problems..........
Installed motherboard drivers, rebooted.....no problems...
Installed the correct driver for graphics card(7300GT)
Booted up ok.
Turned pc off, next morning no bootup!!!.
Uninstalled graphics card driver....
booted up ok...
Installed more recent driver.....
No bootup.

Uninstalled driver...
Booted ok..

Reformat, install Windows XP again, no problem, booted ok.
Installed MB drivers and Graphics card drivers....booted ok.
Turned pc off, left it a few hours...
Turned it on.....no bootup again.
Disconnected everything I could disconnect, no difference.
Unplugged monitor, reconnected monitor, pc booted up ok.
Tried different card and monitor, did not solve it.
Tried monitor on a working pc, nothing wrong with monitor.
Why should unplugging and reconnecting the monitor allow the pc to bootup?
No card drivers = boot every time
Card drivers = no boot unless I disconnect and reconnect monitor.
Ram is ok
Drives are ok
Graphics card works ok in another pc.
My working 9600GT in the new pc.....
nothin.....
It cannot be the psu because we just changed to another(600Watt)this time
Anyone?
Board = KN9 Ultra
CPU = AMD 5200 running at stock.

 

[D13]

so if you have a monitor is literally refuses to boot (fans do not spin up etc...) or it just fails to show image.

WHat source are you getting drivers from? windows update? try going straight to nvidia site or vice versa.

That is strange problem

Is the card brand new? maybe there is somethng wrong with the card socket

 

[musicman53]

so if you have a monitor is literally refuses to boot (fans do not spin up etc...) or it just fails to show image.

WHat source are you getting drivers from? windows update? try going straight to nvidia site or vice versa.

That is strange problem

Is the card brand new? maybe there is somethng wrong with the card socket

NO bootup, cpu fan spins, graphics card fan spins, Case fans spin because they are connected to psu.
New card that was tested in my pc.
My card and the 7300 were tested also in the motherboard and both worked before.
Never use Microsoft for card drivers, alway use Nvidia.
Drive spins up.
IF the card socket was no good then the card would not work at all and like I said, it does after unplugging and reconnecting the monitor.
It's when booting from cold with card drivers that it will not boot unless I do the unplug replug thing.
Without card drivers it will boot everytime until left for hours and then booted(then it will not unless I do the unplug monitor thing)

 

[kylew]

Does the monitor have a USB hub?

My PC won't get past post if I have one of my 2408s on, it gets stuck just before USB initialisation.

It's always reproducible, my PC will always fail to boot if my left screen is on from a cold boot, a restart sometimes works, but cold boots always fail.

The USB hubs for both screens are plugged in, and both work perfectly fine when in windows.

It could be a weird issue, I couldn't figure out what was going on with my PC until I had my monitor on an other PC.

Also, I'd try a newer version of windows, such as the windows 7 RC, it might sound odd, but I've had odd issues with a version of windows.

 

[philip j fry]

Just to rule it out have you tried using another lead from gfx card to monitor

 

[musicman53]

Does the monitor have a USB hub?

My PC won't get past post if I have one of my 2408s on, it gets stuck just before USB initialisation.

It's always reproducible, my PC will always fail to boot if my left screen is on from a cold boot, a restart sometimes works, but cold boots always fail.

The USB hubs for both screens are plugged in, and both work perfectly fine when in windows.

It could be a weird issue, I couldn't figure out what was going on with my PC until I had my monitor on an other PC.

Also, I'd try a newer version of windows, such as the windows 7 RC, it might sound odd, but I've had odd issues with a version of windows.

 

[musicman53]

No usb hub.
One monitor.
Like I said, I tried the monitor on my own pc and it works.
I tried 3 others on the new pc and it will not boot unless I unplug/reconnect the monitor(any monitor)
Tried Vista, tied Windows 7, still the same.
Nothing USB connected.

 

[musicman53]

Just to rule it out have you tried using another lead from gfx card to monitor

Three different cables tired, three different monitors tried.
Different hard drive tried with fresh install of XP, then fresh install Vista and windows 7 in turn.
Still the same.
Without card drivers from Nvidia = boot and run for ages.
With card drivers = boot, run for ages
with or without card drivers from cold = no boot unless unplug/reconnect monitor then will boot and run for ages.
It's not the monitor or card because they work on another pc.

 

[asoxedri]

trying using a different power supply if possible.

cause thats the only thing that comes to mind.

 

[kylew]

I wonder if it's the motherboard? As it seems, you've tried a replacement of everything else but.

 

[toon_mad]

how odd, have you tried connecting all the plugs to a different socket / surge protector just to rule that out aswell

 

[musicman53]

I wonder if it's the motherboard? As it seems, you've tried a replacement of everything else but.

Reckon I sussed it..............
I always have my pc to power up from any key and not from the power button on the tower.
That setting was enabled in the bios.
What it did was every time anyone tried to boot from the normal way(press power button), because in theory power was already applied to the motherboard and was waiting for soft power on(key press), pressing the power button instead only confused it all by trying to make the power/current go to the board that was already there.

I changed it back to button only and problem solved.
Unplugging/reconnecting the monitor must have been like doing soft power on somehow.