Dead CPU or bad mobo?

[Rustik]

Apologies if this is in the wrong forum, if it is please move it.

I just recieved my new setup from newegg, and in my excitement setting things up I did about the most retarded thing I've ever done setting up a system. The CPU fan connection on the motherboard is a 4 pin connector identical to the floppy power connector (3 pin + 1 RPM pin). For some idiotic reason, thinking that the 4 pin CPU fan connector was an input I connected the PSU floppy connector to it and connected the CPU fan to another normal fan connector on the motherboard. Yes, as I've said I realize how stupid this was, so no flaming please. It was just one of those late night retard mistakes.

Anyway, long story short I powered the system up and the fans came on for a second, then went off (no POST beeps). I quickly realized what I did, smacked myself in the face and prayed (albeit halfheartedly) that it didn't destroy anything.

At this point I just wanted to see if the motherboard would post, so I disconnected everything (no RAM, HDDs, vid card, etc). The CPU was in place, the motherboard was connected to the PSU, and I powered it on. The CPU fan and PSU fans came on for about 3 seconds, then went off (again, no POST beeps). I figured the motherboard was fried, so I ordered another one overnight. Just got it today, installed the CPU, left everything disconnected and powered it on to see if it would post (and yes, this time I connected everything correctly). It's doing exactly the same thing; fans come on for a few seconds, no POST beeps, then everything goes quiet.

I've never dealt with a dead CPU before, so I'm not sure how to tell what I killed. The PSU works fine with the setup I'm on now, so it's not the PSU. The motherboard has been replaced so I'm ruling that out. Is the CPU fried? If a CPU is dead will the mobo not POST and give beeps anymore? And lastly, since I'm a poor college student and this was an expensive mistake, is it possible AMD would replace the processor if I were to RMA it as DOA?

Thanks in advance.

Edit:

CPU: AMD Athlon X2 5200+ (socket AM2)
Motherboard: MB ASUS M2N-SLI Deluxe
Memory: Corsair DDR2 800 (4 512MB DIMMs)
PSU: Enermax Liberty ELT500AWT ATX12V 500W
Also tried my 350W Antec PSU and got the same result, and the enermax powers my current setup just fine.
Video: eVGA GeForce 7950GT

If you need any other specs let me know; the unit just won't post. The motherboard manual recommends a 600W PSU for a "fully configured" system, but I'm not running SLI or a ton of HDDs.

I've tried resetting the BIOS several times; removed the CMOS battery and used the reset jumper to no avail. The monitor isn't getting any signal either when the video card is installed.

In my current setup I'm running an ASUS A8N5X, Athlon AMD Athlon 64 3700+, the same video card and the same PSU and everything works fine.

 

[Rustik]

Also, I have a thread going at Overclock.net troubleshooting this, I've posted some stuff there on what I've done so far.

Thread

 

[Conky]

Poor college student? Paying $276 for a 5200+ when a C2D at $180 smokes it?

ANYWAY, I'm not sure what you did to it. From the sounds of it, since you replaced the motherboard and it still doesn't work, it sounds like you figured out how to kill a CPU.

You really ought to think about getting a C2D E6400. If I was any happier with my E6400 at 3.2Ghz 24/7 I would have to soil myself... no really, it's that good.

 

[Rustik]

I like AMD, what can I say. Besides, the X2 5000+ outperforms the E6400 in the runs on Tomshardware, the 5200+ should edge it a bit further.

That aside, I think it's just a bad motherboard. The 307 bios revision doesn't support the X2 5200+, but I would think it should still boot and just run at lower speeds. I honestly don't know at this point what's wrong, but I ordered a Gigabyte board so if that works I'm just sticking with it. If not, it's the CPU.