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Chances are your speakers were "fake rated" as are most consumer quality speakers.
Unless the speakers were rated for CONTINUOUS power at 500 watts each you could easily destroy them with that amp.
Check the DC bias out of the amp. If it is under a volt, your speakers were fake rated.
This fake rating is to sell speakers and depends upon average music programing that does not have continuous high level.
Get professional speakers in MATCHED cabinets that have CONTINUOUS pwer ratings above what the amp can produce. ALSO suggest you put fuses in your speaker leads to protect the speakers.
WITHOUT proper cabinets, the speakers can be blown.
You should probably get a sound level meter to check that you are not damaging your ears. No fun in later life requiring expensive hearing aids! There are professional quality meters for about $140 on eBay.
you will need a 3.5mm TRS minijack to stereo RCA (red & white)lead.
Connect the headphone-out of the laptop to a line input on the reciever - one of the following inputs should work: CD, CD-R in, Tape in. Do not connect to the Phono input
set the output volume of your laptop about 50% to avoid distortion.
As for connecting the amp to the LCD, it really depends what inputs your screen has, but if you can- run HDMI.
if you wanted to use your receiver as your controller and source then try to find out the receivber has got a bridge (jumper) between the pre-amp stage and the power amp stage. if your receiver does not have that, then you can just connect your receiver tape record out to one of your DSP inputs. subwoofers, the DSP has got a sub woofer out connector. you can use that (RCA type) to your sub woofers. put in series because DSP has got only one output for sub. or, you can connect your subs directly to the mains speakers, parallel connections. maybe one sub to your left and the other to your right channel.
First, perform a visual inspection at the back of the unit and verify that speaker wires are not loose or shorting out with another connection. Find the impedance selector switch and verify that it is set to the proper position according to your speakers' impedance. It has to be all the way up or down, never in the middle. (Warning: Do not move the impedance selector while the receiver is powered. Make sure power is OFF on in standby, otherwise receiver will be damaged). Try power ON.
If these actions do not cure the problem, disconnect all speakers and try power ON again. If the unit powers on, it is possible that one or more of your speakers or wires are damaged. If none of the above actions fixes the problem, it is very possible that the receiver's internal circuitry is damaged.