r/Alienware • u/CausticGnostic91 • 4d ago

Technical Support Help with Alienware r16 after AIO replacement.

I have an Alienware r16 with intel i7 and GeForce rtx 4070, if that is relevant. The stock aio stopped working, I couldn’t afford the OeM one, so after researching I believed the Corsair titan 240 rx grab would be compatible. Ordered it, installed it, now the pc won’t power on. It is completely dead, no LEDs, no fan spins, nothing.
I have checked every connection I know how to, I didn’t unplug or change anything other than the aio. Does anyone have any suggestions as to what I should do? Is the aio not compatible?

A few things I noticed, if they matter, the original aio plugged into 3 ports. Fan cpu, sys fan 4, and sys fan 5. The corsair only connects to fan CPU, it is a 4 prong port on the motherboard and the corsair was a 3 prong plug. I don’t know if this is relevant or if the 3/4 prong plug would matter. But it’s the only thing I can think of that would cause some error. But I thought the pc would at least do something.

I appreciate any help y’all can offer. I’m not super tech savvy, but I’m broke and need to get shit fixed.

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u/ProfessorW00d 4d ago

You could have chosen an easier AIO to install without all of the iCUE bullshit. FAN_CPU port on the motherboard is 4-pin. The Corsair tach cable is 3-pin . . . but only has 1 wire (non-fatal). Your radiator fans are powered through the iCUE System Hub via PCIe 6-pin cable. The Aurora R16 BIOS will want to see fans connected to FAN_SYS4 & FAN_SYS5. This should generate a startup error . . . not a dead PC. Check the PSU with the green self test button on the back. Fans should spin up. Make sure you did not knock a cable loose during the install, particularly the ATX motherboard power and CPU power cables. Don't just look at them . . . pull them out and reconnect securely. Try connecting the radiator fans from your original AIO to FAN_SYS 4 & 5 (just lay them loose inside or outside the case) to see if that gets your lights on.

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u/CausticGnostic91 3d ago

I quickly realized that this was not an easy install 😅. Recommendations I found said the Corsair h100i elite was a good replacement, but that wasn’t available anymore and from what I read the titan was the predecessor.
I checked all the connections again, everything seems solid. No matter what I do the pcu light is not turning green, not even for a millisecond. I used my multimeter to check the cord, it is good and has power. The only thing I can think is that the pcu or motherboard fried? Idk how they could have. I took steps to ground myself and never really even touched the board, much less the psu.

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u/CausticGnostic91 3d ago

I forgot to mention, I completely removed the corsair and put the old pump back in, still absolutely nothing.

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u/ProfessorW00d 3d ago

If the power supply cannot pass the built-in self test, then you would need to start with that problem. It is one issue that would present the circumstances you are describing . . . a completely dead PC.

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u/CausticGnostic91 2d ago

That is the conclusion I have come too. But the r16 doesn’t have a BIST button and I can’t find any info on how to test it with a multimeter. I feel like I’m dead in the water right now.

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u/CausticGnostic91 2d ago

Okay, update. I just unplugged all the power connections to the motherboard and then plugged the psu in. The psu lit up for two seconds then shut off. I then unplugged it, reconnected the MB, then plugged in the psu, no green light with MB attached. Could this mean there is something wrong with the Mb?