i3 2120: No Power

On Monday, I upgraded an old pc with an i3 2120, an ASRock H61m motherboard and 8 gigs of kingston HyperX ram. It ran great for 24 hours and then turned off and will not power on (Corsair TX650 psu). When I opened the case I noticed my cpu heatsink had fallen off on one edge. O_O

I can't find any obvious damage but it refuses to power up.

I'm not sure how to proceed from here. Any ideas would be greatly appreciated. ...GREATLY APPRECIATED!

How long did you give it to reset itself? I think the thermal fuse takes a while to reset itself.

Kommissar wrote:

When I opened the case I noticed my cpu heatsink had fallen off on one edge. O_O

CPUs will shut themselves off when overheated, but running without a properly attached heatsink is a good way to get it hot enough to damage before shutdown happens. It only takes a few seconds or so.

Scratched wrote:

How long did you give it to reset itself? I think the thermal fuse takes a while to reset itself.

I left it off all day while I was at work today.

*Legion* wrote:
Kommissar wrote:

When I opened the case I noticed my cpu heatsink had fallen off on one edge. O_O

CPUs will shut themselves off when overheated, but running without a properly attached heatsink is a good way to get it hot enough to damage before shutdown happens. It only takes a few seconds or so.

Will a fried cpu prevent the psu from spinning up? I'm trying to figure out what I need to replace. I think this is going to be painful.

If the power supply doesn't do anything at all when you hit the button there's basically two possibilities, unless I'm forgetting something.

One, a problem with the motherboard's connection to the case so it's not getting the signal to start up, be it fried circuitry somewhere between the front panel connector and the power control circuitry or something else.

The other is the PSU is dead. If you have another PC somewhere with a power supply you know is good then testing is easy. Just take it out of that one and use it to test your downed rig.

If you don't have a spare PSU on hand or another PC to borrow one from, well then testing isn't so easy

I'd be surprised if you don't have damage of some kind though if your CPU heatsink came unseated.

CPU fried, I am afraid....

The CPU is probably okay, despite the alarmism in the thread. Intel CPUs will self-throttle if they're not properly cooled, and you usually have to run one for weeks or months with improper cooling before they'll be damaged. They are extremely robust pieces of silicon. Sitting at home for a day, idling, won't have hurt it.

Usually, when power supplies won't power up, that means there's a short in the case. I'm guessing that you may have an incorrect motherboard mounting post that wasn't quite shorting out against the back of the board, but when the CPU cooler fell off, that was just enough of either a knock or a load change that, well, now it is.

The very first thing to try is to retighten all the cables and all the cards. Make sure everything's in there snug. Remember that there are two power connections to the motherboard, not just one, and double check that both are tight.

If it still absolutely will not power up, then try pulling the board out of the case. See if you can get it running with just the motherboard, CPU, and RAM, sitting on a piece of cardboard or something. If that works, then you've probably got a short, likely a motherboard standoff. A bad cable or bad drive could also be a culprit. If it's still broken, the next thing to try is the power supply.

You have almost certainly NOT fried your CPU, at least not by losing the heatsink. If the power supply failed, it could have zorched any or all of the rest of the components, but simply running without a heatsink would not cause the symptom you are seeing. Even if you miraculously (well, opposite of that, really) HAD fried the CPU, the board would almost certainly still power up when you hit the switch, but then nothing more would happen.

Thanks Malor, I did double check all the connections but I didn't look for a short. I'll try running the mother board outside of the case when I get off work tonight.

Not sure if I read it right, but as I read it, the power goes on, fans are turning....yet, no booting up the pc.
Or is there just plain silence after the power button has been pressed?

I've seen someone turn a pc on, without a heatsink on the cpu. After two times, it was fried. That's why I think it is (was) that.

Sparhawk wrote:

Not sure if I read it right, but as I read it, the power goes on, fans are turning....yet, no booting up the pc.
Or is there just plain silence after the power button has been pressed?

I've seen someone turn a pc on, without a heatsink on the cpu. After two times, it was fried. That's why I think it is (was) that.

That might the case with an older CPU, but as Malor said, the intel i-series is a different animal. It has built in safety measures.

I can't see a fried CPU causing the thing to not power up for any conceivable reason. I'm almost certain, assuming no defective equipment, you should be able to get power with the CPU socket empty. I wouldn't recommend it, but I don't see it as the culprit. I have to agree that a short sounds like the most likely situation. A fried PSU is not likely from these circumstances, but there are defective products out there. It could've failed for an entirely unrelated reason. An incorrectly seated heatsink is, as Malor already pointed out, not likely to cause total CPU death. Pretty sure those safety features have been in place since the Core Duo line.

I've seen someone turn a pc on, without a heatsink on the cpu. After two times, it was fried. That's why I think it is (was) that.

AMD chips were notorious for that. I melted one that way myself. Just a few seconds with no heatsink and wham, dead chip.

Intel chips are much better. You can probably do thermal damage to one if you really try, but it's not likely to happen casually.

Sparhawk wrote:

Not sure if I read it right, but as I read it, the power goes on, fans are turning....yet, no booting up the pc.
Or is there just plain silence after the power button has been pressed?

Nope, I'm getting no signs of power at all. PSU fan isn't even turning on.

Just to be absolutely certain, you did triple-check the power-switch connection to the motherboard?

I've disconnected and reconnected it a few times and I tried swapping it with the reset switch. I have a CM HAF 912 and I'm not sure if the reset switch would work but, I figured it was worth a shot.

Yeah, that should have worked, so it's most likely a short, or a bad power supply.

I tried the mobo outside of the case and the results are the same. I also disconnected the psu from everything and jumped green to black on the 24 pin connector. The fan did spin but it was extremely quiet (I almost thought it didn't work but I could feel the fan exhaust on my hand)

Well, the next thing to try is another PSU. Best Buy carries Corsairs, so you can get a decent one there, sometimes even for a reasonable amount of money; I got an 850 there once cheaper than Newegg. Then, if it doesn't work, return it. This kind of screws over Best Buy, but they're jerks.

Oh, just in case, before you leave -- try pulling and reseating all the RAM, and the CPU. Check for bent pins in the socket, just in case the falling heatsink jostled the CPU enough to screw one up. It probably didn't, but it's easy and free thing to check.

nm, overlooked your latest post.

It's definitely the power supply. I pulled the one from my new PC to test it. I'll have to order one next week. If I spend any more money on stuff this week my wife is going to make me sleep in the dog's crate.

Okay, just keep in mind that, after losing a power supply, you can lose other components for weeks or even months afterward. When the supply blew, it could have weakened components that won't fail for awhile yet. So keep an eye on stuff, and if things go weird, assuming that it's a hardware problem instead of software will be a good default position for six or eight weeks.

When I lost a Corsair 650, it took out about $600 worth of add-in cards.

I received and installed the new power supply on Tuesday and everything is running great so far. I'm sleeping with my fingers crossed.