New cooling system installed, no boot.

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Oh4Sh0

2[H]4U
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Mar 13, 2005
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As the title states, I installed a new swiftech cooling system onto my Asus A8n Sli Deluxe/4000+ SD. With just the 24-pin inserted it'll run for hours (I let it run 2 hours like this to prime the WC loop). However, When I power it down and then insert the 4-pin CPU power connector and turn it on, it starts for a few seconds and then turns off.. CPU looks fine aesthetically (no bent pins, etc) and was working fine earlier in the day.. I've reset it a couple of times and applied new thermal compound (used rubbing alcohol to clean), and nothing. The only thing I can possibly think of is that there is no CPU_FAN connector connected, because there is no cpu fan, and that's why it won't start.. any ideas?
 
Try putting in a fan in the CPU_FAN header, it should work fine.
 
w/o CPU_FAN it'll still boot. it will only make noisy beeping sound and POST something about cpu fan not being there.
 
the board came with a fan to be used when you water cool the chip. it goes on the cooler fins by the back panel for the chip set. plug that into the cpu fan socket and see what happens, hope this helps. i had the same problem but it turned out the block was not seated on the chip and the chip gets hot real fast. if the fan doesnot work , remove the cooling block remove the paste carefully and use a razor blade or charge card to remove most of the excess silver. also do you have the pump hooked up as per the directions with the on switch.
 
I hooked my old cpu fan up to the connector and this is not the problem, still occurring. The computer powers off in about 5 seconds. :( The block is well seated and the pump just starts to run when it shuts down. System doesn't make it to POST
 
Does leaving the 4pin unplugged affect the machines stability?

I ran my DFI for 2 months before I realized I never plugged my 3rd power source into the board, with no problems.
 
the 4-pin I'm talking about is the ATX+12V connector. (Square)

Furthermore, with the ATX inserted, if I remove the cpu from the socket, the computer turns on and everything runs normal. As I mentioned before, the cpu was working fine earlier (now yesterday) before I pulled it and cleaned it, and looks fine aesthetically. It even had 2hrs of off time after cleaning it, as I paperclipped the psu to let the WC kit prime. (No leaks at all either) I've looked at it numerous times for bent pins, and it hasn't seen any conductive fluids or water.. so I'm pretty confused. I'm assuming that with the given information, the cpu has to now be the problem.. but I can't picture why. The IHS is removed on it, so perhaps I over-tightened it and damaged the die (not to my knowledge, it looks fine and I didn't tighten anything past "snug"). I've been putting the cpu in the socket and clamping it, and trying to let it start without a cooling device. (I know it'll atleast make it to post before it would overheat anyways.)

Any last ditch suggestions before I toss the cpu and buy a new one? :(
 
Oh4Sh0 said:
I've been putting the cpu in the socket and clamping it, and trying to let it start without a cooling device. (I know it'll atleast make it to post before it would overheat anyways.) :(
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You put the processor on with no heatsink. Just doing that may kill the proccessor. And I don't think it would make it to post like that. Even with a heatsink the proccessor will get up to 30C-40C without a heavy load, with no heatsink it will be wayyyy hotter than that pretty much right away.

 
I think it'll make it the <5 sec to post. I've started the computer without having my zalman plugged in before, and granted, that's a big heatsink, but it ran for almost 30mins before it had a thermal shutdown due to temps of 70 deg C. And no, 70 degrees C is damn hot, but it won't "kill" the processor unless it's ran there for hours.

Irregardless, the waterblock has been on it many times, and I'm certain it's making good surface contact, because I can see where the thermal paste is spread.
 
have you tested you psu? how much power @ 12v? I had major problems with my asus a8n-sli deluxe and a antec PSU. I got fed up and changed my Neo550 for a BFG650 (bestbuy gift card) and it was rock solid afterwards.

I think that you're drawing to much power by having the ATX12v1 plugged in, which is why it will turn on for a second and turn right off. Normally thats the PSU envoking the shutdown cause you trying to draw to much power down 12v line.

Try this, unplugg everything but cpu fan, 1 HD and video card (if you have a powered video card) and the ATX12v1 (4 pin). Does it boot? If so then you need a higher rated PSU, or maybe swap around the wiring so that you dont load up 1 line with 3 devices + 3-4 fans etc etc.

If it still doesnt boot, then it probaly most likely the PSU or the board itself (maybe check the cable and make sure nothing blocking its contacts, check the socket (4pin) on the board make sure its free of any dust or anything like that.

If you have a multi meter, bust that bad boy out and test all the lines on the PSU, make sure you know what your doing before you go and stick metal probes in your PSU molex and power connections. Test it at idle, test it at load etc etc, record the readings and make sure they within their rated spec.
 
The PSU is a Smartpower 2.0 (500w). It ran everything fine previously (obviously with the exception of the WC pump.. but that's the only thing new). I don't think this is a problem, because I removed all the hd's and fans and still nothing new.

I'm not really sure why this was moved to OC and cooling.. the problem really has nothing to do with that at all.
 
Oh4Sh0 said:
I think it'll make it the <5 sec to post. I've started the computer without having my zalman plugged in before, and granted, that's a big heatsink, but it ran for almost 30mins before it had a thermal shutdown due to temps of 70 deg C. .
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NO NO NO...if you ran the cpu with NO heatsink AT ALL...it will NOT make the 4-5 seconds it needs to boot/post properly....
 
Oh4Sh0 said:
The IHS is removed on it, so perhaps I over-tightened it and damaged the die (not to my knowledge, it looks fine and I didn't tighten anything past "snug"). I've been putting the cpu in the socket and clamping it, and trying to let it start without a cooling device. (I know it'll atleast make it to post before it would overheat anyways.)

Any last ditch suggestions before I toss the cpu and buy a new one? :(
Click to expand...


You pooch screwed the cpu, NO COOLING DEVICE AT ALL? No, not good, ever. Get a new cpu. NEVER run a cpu (especially AMD) without a cooler on it, period, ESPECIALLY a cpu with no heat spreader....
 
Oh4Sh0 said:
I'm not really sure why this was moved to OC and cooling.. the problem really has nothing to do with that at all.
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It was moved because you NEED COOLING....a bare cpu is NO GOOD......it will NOT MAKE POST without a cooler, the cpu can hit thermal overload in literally, less than a second, two if it was a low speed unit, maybe....
 
if you would take the time to read the initial couple couple of posts, you will notice the cpu was seatted and re-seatted with the water block attached. It was only after that (When I figured it had to be the cpu) that I tried other methods. I got the same problems both ways, so I'm assuming I did something to damage the cpu before it ever made it to the socket.
 
Was not being mean. Even if it was something else before, now that you ran the cpu with NO cooling, it most likely is harmed....
 
Yeah, I'm pretty sure at this point it was already dead. Nothing else to test it with, but I can't find any other component that could possibly be causing the problem with the exception of course of the mobo. I ordered a 3800+ on Saturday, which is a shame that it had to replace my 4000+, which was a damn good OC'er
 
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