See if the power light goes amber after power up. I had
(have - still siting in my basement) one that did same. Power up, fans go full blast . Power light goes and stays amber. This is USUALLY
caused by bad capacitors on the mother board. Known GX280 problem going
back. If you look on the motherboard, the capacitors should have flat
tops and not leaking. If the are rounded or leaking, the MB has
probably gone bad.
I obviously can not be 100% sure about this as the unit is not here.
You can google "gx280 solid amber light loud fan" and see the issues. Here is one such link.
http://en.community.dell.com/support-forums/desktop/f/3514/p/19253544/19414291.aspx
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