if your lnb is more than 200khz off the lnb freq 9750 (happens often!) then you will never see the beacon in the lower window. try to first find the psk beacon frequency without any entered lo and then calculate your real lo frequency.
in my case here i receive the psk beacon on 1101.048650 mhz.
real frequency is 10489.800mhz so my lo is exactly 9388.75135mhz.
entered that lo into sdr console and set the frequency display to "99" ghz you can now tune to 10489.800mhz and you see the beacon in the lower window almost in the middle