I agree with Steve on his procedure, but my experience says that it is good to use an electronics cleaning spray and spray it on the contacts of the cards and backplane.
TV room: 861v8, 800v4, UHD722,Front 2xDSP7200SE, DSP7200HCSE, Side DSP5200, Rear DSP33, DSW, (DD 15 Sub),
Roon Rock NUC, QNAP NAS, Chromecast Ultra, Apple TV, Oppo BDP-105D, Pro-ject Pre box S2 digital, Philips Pronto remotes, Supra LoRad Power.
Office: 800v3, MS200, DSP3100
Basement: MS600, 502, 557, Dynaudio 52se, Dynaudio Sub 250
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