we had a bad storm and afterward my motherboard seems to be fried. I have insurance however they are saying that since my power supply is not fried the motherboard issue is not from a power surge. I need to know if it is possible to fry the mobo and not the power supply.
thank you for any input on this issue.
Yes this is possible, and more important, very probable!
The motherboard has a lot more sensitive components as compared to a PSU.
Let's say that there was a momentary spike in voltage due to the storm. The PSU is rugged enough to handle this, whereas the motherboard is not. The result would be a fried motherboard and an unaffected PSU.
After all, a PSU is basically a step down transformer and an AC to DC rectifier along with voltage smoothing circuitry.
The motherboard has ICs, caps, traces, Northbridge, Southbridge, RAID circuitry, etc. to mention a few. Certainly more sophisticated than a PSU by a very wide margin.
I wouldn't even think of comparing a PSU with the complexicity and sensitivity of a motherboard.
Tell your insurance guy (or gal) that they are full of crap and to engage their brain before they put their mouth in gear!