did I cook my c2d? new system dead

[AlexG]

Hello friends. I'm comming here because I havn't solved my problem at some other tech sites and I know you guys are good. If this isn't the correct section to post in just let me know.

System specs:

mobo - asus p5b deluxe, cpu - c2d e6600 4meg retail, ram - super talent t800 2 x 1 g, psu - ocz 700w 7000 gsxssli, gfx - bfg 8800 gts, cooler - scythe infinity

1. Built this out of the case - it's sitting on a phone book, so no mobo short.

2. Booted up fine so I began following the core duo OC guidelines at Toms Hardware. Yes, there was some minor overvolting - ram 2.15 cpu 2.4, certainly well within range of what is considered safe.

3. Gradually took CPU to 3.75 where it began to lock up running memtest 86. So I took it down to about 3.5 (iirc) and left memtest running for about 45 mins while I went to store.

4. Upon return system was off and now will not boot. When power is turned on all fans spin momentarily(HSF, PSU'GFX), then nothing. The mobo light still comes on whenever psu is attached and PSU is set to on.


OK, here's what I have tried:

1. Reset CMOS
2. Left CMOS battery out all night
3. Tried I ram only stick in all slots, tried the other stick.
4. Rebuilt system. Checked and dbl checked. All power cables hooked to vid card, main, and cpu.
5. Tested PSU with a cheap PSU testor, only 20 leads, but PSU fires up and testor light is green.
6. Examined CPU for any damage and none.
7. Examined MOBO for busted caps and none.
8. I'm pretty darn sure HSF is making good contact.
9. Tried old PCI vid card with PCIe out of system

This is my first PCIe system, with the new RAM and all that and I have no parts to switch out!

[mikecol]

2. If you really went to 2.4V on the CPU then it's dead. Stock is usually 1.25V and maybe you could go to 1.45 or 1.5 for a short time for testing. Or are you stating freq? Your comment is on overvolting.

Did you note the temps before cooking it?

[Speederlander]

2. If you really went to 2.4V on the CPU then it's dead. Stock is usually 1.25V and maybe you could go to 1.45 or 1.5 for a short time for testing. Or are you stating freq? Your comment is on overvolting.

Did you note the temps before cooking it?
He must mean GHz? You can't even get 2.4v w/o mobo mods can you?

[NickS]

I think he meant 1.4v ;)

[AlexG]

I'm meant 2.4! BUT! It was set to 1.4. I just forgot. I was following the c2d OC guide at Toms to the letter.

OK, new info. It was on a phone book, somebody suggested this may have cooked MOBO from below due to lack of airflow. He suggested removing all companents - just PSU and MOBO - turning on system and seeing if the PSU stayed on.

so

I took out everything, cpu, ram, vid - hooked up to PSU, tried turning on system, PSU came on and stayed on and THEN SMOKE from MOBO, near large heatsink. Oh shiz! Did I do something new or dowes this simply confirm the MOBO is bad?

[syne_24]

Did it have a burning smell when you got back?

I was testing my ram on my friend's P5B-D and we max out on vdim, vmch, vfsb, and when i rebooted that thing blew up on us. And I mean blew up, I thought it was the psu at first but there was a smell coming directly from the board. Then we thought it was ram or cpu but it was actually the mobo.

If you can get another board to test out each components and make sure it still works. If it still works then it's the board. We looked at the board but couldnt tell anything, probably one of the vrm got burned.

[AlexG]

Did it have a burning smell when you got back?

I was testing my ram on my friend's P5B-D and we max out on vdim, vmch, vfsb, and when i rebooted that thing blew up on us. And I mean blew up, I thought it was the psu at first but there was a smell coming directly from the board. Then we thought it was ram or cpu but it was actually the mobo.

If you can get another board to test out each components and make sure it still works. If it still works then it's the board. We looked at the board but couldnt tell anything, probably one of the vrm got burned.


Didn't notice smell first time but I was away long enough it would prolly have been gone. But see above post, burned now!

[syne_24]

Yea sounds like you need a new mobo. Same thing happen after we plug it back in, smoke started coming up around the cpu area too. And it's not the cpu because we never mess with it. I think there are a few bad P5B-D out there because my friend never max out anything on his board until I came. And once we did that, is when it started going crap on us. Like I say the best way to get another board, it's really hard to second guess on it and risk damaging your components.

[AlexG]

OK then, I'm gonna RMA the p5b and hope for the best. The CPU shouldn't have cooked should it? An hour or so at 3.5 volted at 1.4? With a Scythe Infinity on it.

It must have been MOBO.

Any other thoughts before I RMA.

[Speederlander]

Was your heatsink not getting any contact with CPU? What were your temps in bios?

[AlexG]

Small chance HS may have popped up at one corner. One of the plugs may have not been in ALL the way through. That darn Scythe infinity is hard to work around. Could have popped off a bit after I left it. Had yet to check temps.

Grease was smooth over whole chip and sink after removal. I think it was flush but I could be wrong.

Did you see above post about the smoke from MOBO?

[Exar Jun]

I had a p5b that died on me yesterday...not even installed xp on it yet...something by the mosfets cooked but I cant tell from looking at it. Just powers up for a few seconds then back down. I am sending it for RMA.

[musk]

I bet my eye that its the mobo. The same thing happened to me not long ago. Everything was fine then boom, gone. Mobo dead. Powers but no post.

I didn't have gear to test so I took it to the comp store to test proc and board. RMA on the way

[AlexG]

I bet my eye that its the mobo. The same thing happened to me not long ago. Everything was fine then boom, gone. Mobo dead. Powers but no post.

I didn't have gear to test so I took it to the comp store to test proc and board. RMA on the way

Thx musk. The MOBO is on it's way to RMAland as we speak. My fingers are crossed. Bummer for you too but let's hops alls well that ends well;)

[AlexG]

I bet my eye that its the mobo. The same thing happened to me not long ago. Everything was fine then boom, gone. Mobo dead. Powers but no post.

I didn't have gear to test so I took it to the comp store to test proc and board. RMA on the way

You can keep your left eye musk, CPU is fine, tested at the store - that leaves MOBO or RAM and since the mobo was smoking, we have a er, smoking gun. Thanks again all!

[Jedi2155]

Well, although I had a very similar problem with my 680i (system wouldn't boot, lights up etc.)

Try unplugging the system, then hold on to the power switch for a couple of seconds to "discharge" the motherboard (this works for my 680i board and probably a universal thing), and then bam, it booted fine. Thats my guess.

[nettwerk2006]

2. If you really went to 2.4V on the CPU then it's dead. Stock is usually 1.25V and maybe you could go to 1.45 or 1.5 for a short time for testing.

:slapass: I've run my E6600 at 1.56V 24/7 for over 6 months now, and sadly a week24, but the cpu is just as stable as the day I bought it.

[AlexG]

:slapass: I've run my E6600 at 1.56V 24/7 for over 6 months now, and sadly a week24, but the cpu is just as stable as the day I bought it.
I take it by 'week 24' you are referring to a certain batch that didn't clock so well? Or did you mean something else?

On this subject, I wonder about my chip's stepping , I got an sl9s8 Malay, any good? also says L639A398

I forgot how to read this stuff.

[T07N]

I had a p5b that died on me yesterday...not even installed xp on it yet...something by the mosfets cooked but I cant tell from looking at it. Just powers up for a few seconds then back down. I am sending it for RMA.

Did it smell? Mine did... For $200 retail I'm expecting better quality. Bad quality boards overcharged by Asus?

[StealthyFish]

Did it smell? Mine did... For $200 retail I'm expecting better quality. Bad quality boards overcharged by Asus?

it's asus. all of it is overcharged, lol. Anyway, the Silicon smell should have been extremely prevalent. there's a certain smell to it. First time I smelled it, i knew that something burned. So far, i've had a PSU burn out, etc.... even after a bit of time, if you smell the PCB, you can tell where the burning came from.

well, I'm gonna agree with the rest of the guys when they say that it sounds like it was the motherboard.

[Bootup05]

Same thing happened here, Was the NB IIRC, running fine for 4 hours, then bang, system goes, won't post, tried all of above but no post.

TBH I think the contact that Asus put on these HS's to chips are :banana::banana::banana::banana:e, you're lucky if half of your chip is covered.

When you get your new board remember to reseat the NB and SB HS's and apply something like AS5 or Ceramique, anything better than the Stock paste:)

[musk]

Same thing happened here, Was the NB IIRC, running fine for 4 hours, then bang, system goes, won't post, tried all of above but no post.

TBH I think the contact that Asus put on these HS's to chips are :banana::banana::banana::banana:e, you're lucky if half of your chip is covered.

When you get your new board remember to reseat the NB and SB HS's and apply something like AS5 or Ceramique, anything better than the Stock paste:)


i have done that on both P5B dlx's that have gone dead in the middle of the night. i even put one of these (http://www.ncix.com/products/index.php?sku=20939&vpn=NC-U6&manufacture=Noctua) on there with a 40mm fan and put heatsinks on the mosfets. 2wice now :slapass:

I have 2 now in revolving RMA.