Strange BIOS / No input signal problem...

jimbobsimmonds

jimbobsimmonds

jimbobsimmonds

Associate
Joined
29 Nov 2010
Posts
7
Hi all.

I am literally at my wits end trying everything with this PC, asking everyone and 8 weeks later no luck...

basically, i have a computer that, for some reason will boot some of the time and other times just will not. Resetting the CMOS seems to help but not everytime...

All i get is "no input signal" and it doesn't even go to BIOS...

here is what i have tried...

Another mobo
another G-Card
Removing reset button
new monitor/cables
new PSU
turning to jesus

none of the above have worked...

really on my last straw and considering selling for bits...

cheers
jimbob
 
well before the mobo was a Foxconn 975X7AB-8EKRS2H with 2 sticks of Samsung DDR1 1Gb RAM. and an intel 2.66GHz quadcore processor and 2 crossfired ati radeon x1950XTX... also has 2 hotswappable 500Gb HDDs (sorry cannot be more precise, will check hardware next time it starts)

I bought an 850W PSU, new P5KC mobo, 4Gb new RAM (compliment the 2 in there) and a new ATi radeon 4870 g card. , DVD R/W and a decent used case.

yes, 8 weeks and a lot of money and swearing i still can't get it going consistently...
 
Last edited:
Your new RAM is it DDR2 or DDR3?
is this your Motherboard?
As you've bought the new stuff you might aswell use it:

Connect your motherboard with your CPU, 1 stick of your new RAM (providing its DDR2 or 3), your boot drive, and your new graphics card & your new PSU.
If you can do this outside of the case so we can rule out shorting the board.
It'll be messy but does it boot?
 
I really want to prove that its not your CPU (the only item it seems you haven't swapped. Is it a Q9400 / Q9450?

Yeah i noticed that it had DDR3 specific slots. Ignore them
Firstly If we connect the minimum, newest components and can get it booted and stay booted we can carry on working our way through.

I've had RAM cause this problem before but in all honesty its such an open problem it could well be anything.
 
CPUs very rarely die but it happens.
If it doesn't always boot then it can be a overheating or a faulty chip.
Did you re-apply thermal paste when you changed motherboards?
Also CPU is the only real requirement to POST. you need CPU, motherboard and power. it will at least beep if anything else is missing.
 
doesn't beep even when it starts good :)

and i dont know about the thermal paste as a mate did it but it seems unlikely the same fault would occur on 2 mobos... CPU looking like a prime candidate now...
 
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