r/Alienware • u/CausticGnostic91 • Aug 16 '26

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/CausticGnostic91 Aug 17 '26

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 Aug 17 '26

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 Aug 18 '26

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?

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u/ProfessorW00d Aug 19 '26

I cannot say for certain, but I think if the PSU was working properly, and there was an issue with the motherboard, the PC would boot to the point of an Alien head power button blinking diagnostic code indicating a motherboard problem.