One problem with pre-built pc's is the psu.
They will only be strong enough to power the originally installed components.
The most critical component is the graphics card.
Here is a list of the wattage recommended for various graphics cards:
http://www.realhardtechx.com/index_archivos/Page362.htm
GTX1060 3gb needs 450w.
Then, also is the quality of the card. Bronze is only an efficiency rating, it means nothing.
What counts is the ability to deliver amps on the +12v outputs where modern processors and graphics cards need them.
If you will upgrade the psu, look for a quality unit with a 7 to 10 year warranty.
Here is a list of quality tiers:
PSU Tier List 4.0 rev. 14.8 (END OF LIFE) Last Update: 27-07-2021 Legend : Gray - EoL/obsolete and/or otherwise not recommended for purchase. Green - small form-factor (gold and blue colors are disregarded due to scarcity of SFX PSUs) Gold - best units in the tier (includes requirements for blue ...
linustechtips.com
3060 is going to want 550w.
I have no problem overprovisioning a PSU a bit. Say by 20% for 650/750w.
It will allow for a stronger future graphics card upgrade.
It will run cooler, quieter, and more efficiently in the middle third of it's range.
A PSU will only use the wattage demanded of it, regardless of it's max capability.
Considering current gpu pricing, I would try to wait a bit.
3060 cards without mining capability are coming out soon.