Re-Connecting To Verizon DSL ?

Hello:

Really not sharp or competent with this stuff anymore (70 yrs old now ), and
would be most grateful for any advice.

Running XP, and a friend (no longer in area) set me up with a LinkSys
wireless router so I could use my portable anywhere in the house.
Frankly, I know even less about routers than I know about PC's in general.

Have Verizon DSL which has always worked pretty well.
A few days ago, they had a problem with their street wires, and we had no
phone, or DSL.
They fixed it, and we now have phone again, but the DSL won't connect.

They say it's a "PC problem, of some sort"
It probably is, I imagine.

Is it all likely that the LinkSys router has lost sync. in some way ?
Should I unplug it, and plug it in again to re-set it (I don't want to make
things worse) ?

Or, do I just have to tell my PC, somehow, to re-connect with Verizon ?

If someone could please outline the "exact" steps, and what I should
actually click on, I should go thru to do this, would be most appreciative.

Thanks for your time,
B.