I suppose Bell had you reset the receiver by unplugging it for a minute or so, right and your ran a 'check switch'. Otherwise it's either your cabling, your switch, your LNB, or your receiver. Sometimes water gets into the cable, LNB, or switch, and it corrodes. MY guess, the cables from the dish to the switch and the LNBs are okay, or else you'd still get at least one satellite. So it's likely the switch or the cable from the switch to the receiver.
Try what ken says and if it doesn't work, replace the cable or it's connections from the switch to the receiver.
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