Computer no start

timbo2410

timbo2410

timbo2410

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Joined
27 Dec 2009
Posts
764
I just replaced the CPU fan, the two case fans, the Northbridge fan with a heatsink and the power supply. I started it up and the normal startup screen came on then the system just shut down. I have re-booted anumber of times now but I don't even get the bios screen .... any hints?
 
I have a green light on the mobo .... the fans all work .... the new heatsink on the Northbridge is warm (but not hot), I can hear the HDD's spinning .....but nothing on the screen ..... :confused:
I even plugged the old fan on the Northbridge back in to see if it was the lack of a fan that was causing the problem .... nope ...
 
Oh heck .... don't say that .... is there an y way of testing it to see if it's the PSU ?? Like I said all the fans work, I can hear the HDD's, the "C" drive is active according to the blue LED on the front panel ....
 
hmm... seems unlikely.

check all the connections to your graphics card - is the monitor cable securely connected? if the card draws extra power from the psu, is this cable connected?
have you tried a different monitor cable?
is the monitor still working correctly?

check all of these, post results
 
Ok here we go:
The monitor worksI just tried it on the second computer. When I first booted it was displaying the normal startup screen prior to going into windows but before I could see if there were any error messages it just went blank.
The system I wired up just like the old PSU and the graphics cards are both powered by a separate IDE cable to the PSU (the new PSU is a Corsair HX 750). The graphics cards are Asus 7800 GTX in sli ..... I have checked and re-checked all cables and plugs and none are loose. I get both dvd drives powering up on startup along with the HDD's and of course the fans are all running ....
 
did you check the connection of the power cable to the psu?
try resetting the bios
otherwise, put the old psu back in just to make sure

if it is not the psu, test each of the components individually, stuff like taking one of the graphics cards out, and test stuff in your other rig
 
uummm ok how do I reset the bios? ... but tomorrow I will start re-connecting the old PSU .... the main lead from the new PSU is hard wired to the PSU itself and I checked the connection of the 20? pin connector and that seems fine ....
 
Have you the 4 pin atx connector plugged in, usually located up in the top rear section of the board.
 
right I pulled out the battery and left it for a while then re-booted ... nothing. I unplugged everything accept the C drive and still nothing ... I unplugged all the fans ... nothing. If I unplug the monitor cable from the top video card the display changes to "NO SIGNAL" but if it's plugged in it goes to a black screen ... tomorrow I'll take out the sli cards, swap top to bottom and run a single card to see if that makes a difference ...
 
do you hear a beep when you switch the pc on? If you don't then it's nothing to do with the gfx card or monitor..more likely PSU.
 
OK here is where I stand today. Unplugged from the new PSU and plugged in the old one to the mobo (the big connection and the 4 pin plug), the graphics cards and the C drive .... nothing else. Still no joy. I have swapped around the vid cards and tried single but nothing. .... still the same.
I have never had a "beep" when starting the computer ever in fact I cannot even find a speaker. So a beep is not going to happen. So does this mean that my mobo is knackered? Or the CPU ?
 
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