CPU/Mobo Computer doesn't turn on - causes mains to trip.

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No, the RS series comes with a cable that has a RJ45 (LAN) connector on one end and a USB A connector on the other. The UPS should have a port at the back which accepts the 'LAN' end, and the other goes into a USB port on your laptop.
 
Ah, I don't have the cable since this UPS was a hand-me-down from my dad's office. I do have an Apple Mac Pro computer with me though. Maybe I could try powering it with the UPS alone and see if it boots up? Would that help? I guess the load should be similar to that of my PC.

The only thing I had connected directly to the UPS when the PSU blew was my PC cabinet. Monitor, Modem etc were connected separately to a spike buster going to another socket in the wall (powered by home inverter.)
 
Nope, not until you are able to whitelist the UPS. Is it running with no load/slight load connected? You can try a table fan. Keep the UPS connected to mains before power up, run your load, then turn off the mains. Report back.
 
I don't have a table fan, but it seems to run with no load connected. I tried a steam iron and after a few seconds, the UPS let out a long beep and the red "Replace Battery" led flashed.
 
Steam iron may too violent a load, and could have damaged the UPS, so you'd be lucky to have got away with that if you did.

Unless, of course, your iron is less than 400 or 500W. They are usually range to about 800W, the limit of a 1100VA unit and well past that of a slightly used one.

Anyway, if it is still running it seems to be alive, mostly. Another load you can try is a monitor with input cables disconnected and set to full brightness. The backlight should activate and run at full power with the 'no input cable' sign displayed, which you can disregard. If you have a printer you can add that as well, and test both power on and backup.

FWIW the battery on my APC is toast too, it barely lasts 5 minutes at mild load of 300W and needs everything to be switched on only when mains is present as it can't handle the startup surge of my 600W+ system. And it's about two years old - so you may also need a new battery.
 
I can replace the UPS at a later date. Right now I just want to make sure the new PSU that I get won't have trouble again. When I get it, should I connect the UPS to the mains and not the backup line?

What if I don't use a UPS at all and directly connect to an inverter backup socket? We have a power cut of 2 hours every day here in Chennai, and sometimes I may have to work through that, but that's not a priority. Can I go ahead and get a new PSU? I spoke to Corsair RMA and they said they'd give me a new unit in a week, but I've lost faith in them, at least the GS series.
 
When I get it, should I connect the UPS to the mains and not the backup line?

Yes.

What if I don't use a UPS at all and directly connect to an inverter backup socket?

No, even if you do not use a UPS do not depend on inverter. Remember we have not yet cleared your inverter of causing the issues. The inverter, UPS and PSU are all switching supplies that have unknown startup behaviour and we don't know which interaction has caused the problem. Since we do not have reliable identification of victim and suspect, it is probably a better bet to rely on the mains and switch the PC off properly as per schedule till you can get a new UPS.
 
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Well I ordered the Seasonic yesterday and it came in today. I installed it, but now my PC isn't booting up. I can see the LED in the motherboard, but pressing the power button doesn't do anything. I think I have all the connectors connected properly (including the small 4 pin one near the CPU).

The fans don't spin at all, not even for half a second.
 
Try booting up without the graphics card installed (use the motherboard graphic output), and only one RAM stick. Try changing over to the other RAM stick. We have to figure what the PSU took with it when it exploded.
 
Correct me if I'm wrong, but would other components such as video card and RAM stop the PSU fans from even spinning slightly? Like there's no signs of life except for the little green LED on the motherboard.

I'll try it anyway.

Edit: It seems like you were right. I unplugged the video card and the fans run normally.

Update 2 - When I switch around the PCI-E power connections (2 power connectors from the PSU), it seems to boot up even with the graphic card. Gonna try connecting everything now and using it normally. Let's see how it goes.
 
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