Originally Posted by
DarkXale
Firstly, to find out what the light means - check the Manual? Thats what its for. (It very likely is an overload warning, but with the given information its impossible to be certain)
Secondly, the PSU rating does not specify how much power it requires from the socket. It specifies how much it can supply to the machine. Actual power requirement will be higher, based on efficiency. An 80% efficient 500W PSU for example will require 625W, when running at capacity.
To further complicate matters however, thats not necessarily what your power requirements are; the PSU will only draw the power your components require.
However you've not given any information which we'd need to figure out what your power requirements are. We'd need:
1) Installed hardware. Specifically CPU, GPU(s), PSU, and any overclocks.
2) Other connected stuff to the UPS, such as Speakers and Monitor.