G3 Beige: grey screen at startup; no icon; won't boot from CD

G3 Beige, OS 9.2; working perfectly for past year.
I was using a D-Link wired router, to this and my other Mac, G4 Graphite OS X Tiger.
Having just gotten a netbook, I installed a D-Link wireless router (DIR-615), and changed the ethernet cables for both (non-wireless) Macs over to the new router. (It had been configured for me by a Staples Associate where I bought it.)
The netbook and the Graphite G4 worked as they should, but upon restart, the G3 Beige not only wouldn’t boot, it didn’t even show a sad Mac or a question mark. It chimed, but only has a grey screen. Cursor works (& keyboard); nothing else.
I disconnected ethernet cable; same grey screen upon restart.
Won’t boot from Norton or Mac OS 9 CD, pressing “C” at startup.
Zapping pram didn’t help.
Shift during startup didn’t help.
Now what??
TIA.
PS: Meanwhile, I'm afraid to connect my emergency spare 7300 w/G3 upgrade & OS 9.1 to that router. Should I?

The next thing to try is re-seating the sound card. The backpanel is only well-supported on one side, and the sound card takes a beating in all the Beige G3s and similar Macs with tumble-open or lift open designs (but not the All-in-One). Jeff suggests you remove the exterior third screw \[and leave it out] and bend the top tab slightly before re-installing the two screws on the rail. This helps push the sound card back into the slot and keep it firmly seated.
Do you have any SCSI devices or SCSI cables connected? A dangling SCSI cable or a badly-terminated SCSI device can cause a Hang where you describe.

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