[Amps] Hercules II fault

[Terry Zivney]

 My Hercules II  was working but now..
On power up (with matching TenTec power supply) the frontpanel fault light comes on as does the fan.  Waiting a fewseconds, the red led fault light dims out and the fan stops,but the meter lights still have full brightness.  The ampdoes not switch over to XMT (a good thing, without the blower!)
Any ideas what to check first?
Terry N4TZ