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troubleshoooting a failed boot

D

davegl1234

Weaksauce
Joined
Aug 14, 2010
Messages
75
Hi,

I recently sold a cpu/motherboard bundle on ebay that was pre-installed in a case.

Specs:
i7 920@3.8
P6td deluxe motherboard
6gb corsair dominators
haf x 932 case

Somehow in transit royal mail managed to dislodge the two fans on the cpu heatsink, and what appears to be the floppy disk bay (even though i have never even touched this). Not sure what they did to it, but the buyer is a bit worried something has been damaged during transport (it is insured fortunately).

He is a little wary of buying a new power supply without checking the system works, so has hooked up his old power supply (Cit 500w):

http://www.aone.co.uk/ProdInfo.ASP?ProductID=2303

along with his old gpu (nvidia 7300 gs).

Whilst 500w should be enough, if you look at the link, there are two 12v rails...am i right in thinking only one of these can power a single component, therefore only having a maximum of 14x12 = 168w available for any one component?

The question is, will 168w be enough to power up an i7 920 @ 3.8 (around 1.25v)? I've seen estimates that suggest it would need more power at load....but then would it have issues even starting up the pc?

I.e is the psu i've linked powerful enough to startup the rig described (bearing in mind the amps on the two 12volt rails), or is it more likely royal mail have just broken it?

Thanks
 
He's fine using it just to test it. The computer won't pull anywhere near 500 watts while booting and idling. The CPU itself will probably peak around 100 watts during boot.
 
i forgot to mention that he has tried using it and doesn't get a signal at his monitor.

I guess that means it got damaged in transit rather than the psu being too weak?
 
If everything powers up, and there is no signal, then there's the possibility of bad RAM, bad CPU, bad motherboard, or bad GPU, or any combination of that. There's also the possibility of improperly seated RAM or GPU. Then there's also the possibility of a bad PSU, or all the PSU connectors not being plugged in properly. Not plugging in the 4-pin CPU power cable can also cause this.
 
i've asked him to try a few things to assess some of the things you list as best as possible, but i just want to rule out that the psu (if we assume its working, it was on his last pc) is actually capable of powering the system? The parts all worked fine this end, so if the psu is good enough then i'll start making a claim at royal mail.

A new 500 watt psu would do this no problem, but it is pretty old and has only 14amps on one 12 volt rail, and 13 amps on the other.

Just wondering if that would definitely be enough?
 
If it can put out its rated specs, then yes, it is definitely enough.
 
wait, just noticed something significant.

The power supply only has a 4-pin cpu connector, whereas the p6td motherboard has an 8-pin cpu connector.
 
That would work fine as long as he plugged it in properly.
 
Tsumi said:
If everything powers up, and there is no signal, then there's the possibility of bad RAM, bad CPU, bad motherboard, or bad GPU, or any combination of that. There's also the possibility of improperly seated RAM or GPU. Then there's also the possibility of a bad PSU, or all the PSU connectors not being plugged in properly. Not plugging in the 4-pin CPU power cable can also cause this.
Click to expand...

This information is spot on, If another PSU and another GPU have been tested on the board then I would move on to system RAM or motherboard itself. Test the system with 1 stick at a time. Sounds like the system may have been jolted pretty good, and if one of the ram sticks is just slightly loose it will cause a no video signal scenario. I would also recommend re-seating the CPU and CPU heatink as well.

Also does the motherboard normally give any sort of beep codes or diagnostic codes? Is it giving anything now as far as beep codes?

If things were rattling around inside the computer tower during transit a very thorough visual inspection might be a good idea as well, basically check to make sure the motherboard PCB wasnt damaged at all.
 
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