Possible ethernet can corrupt OS/X?

I've had THREE (3) hard drive issues with brand new Macbook Pro. Only seem to occur when boot up connected to cable internet (Motorola router model SB5100, ethernet cable info:35 OHMZ type CM 24AWG ETL verifiedTIA/EIA-568-B.2 CAT .5e UTP 4PR)
When Macbook Pro boots up NOT physically connected to cable modem, no problem. When Macbook Pro boots up physically connected to Adelphia (now Comcast?) cable modem...get blank gray screen, then after few minutes, get blinking file folder icon with question mark in it. (it is not recognizing hard drive at this point and either operating system software has been corrupted, or hard drive is bad.
1st time this happened, Apple store said hard drive hardware was bad, replaced computer. 2nd time, also within first week of purchase, computer booted fine to wireless networks, or no network, but when boot while connected to Adelphia motorola modem via ethernet, bam, gray screen, then question mark file folder again. Apple store said OS/X was corrupted, we re-installed and everything fine.
I subsequently connected MacBook Pro to a different high speed cable connection (Charter cable) with no problem, ran for a month. Come back to connect to Adelphia, bam, gray screen, blinking question mark file folder...coinidence? or has anyone else every heard of corruption occuring via ethernet cable?

Come back to connect to Adelphia, bam, gray screen, blinking question mark file folder...coinidence? or has anyone else every heard of corruption occuring via ethernet cable?
I guess I'd place my bet on co-incidence at this point.
BTW if you are concerned that the airport card is somehow interfering with the wired connection, have you tried turning airport off first? It seems unlikely that there would be any connection between the two, but turning off the airport should ease your mind about that.
I wouldn't rule out household wiring problems so quickly. The metal case on the MBP might deal with reversed polarity or a bad ground differently from the plastic case on the MB. Admittedly it's a long shot, but your problem is pretty unusual to begin with. You can buy a yellow outlet tester at Walmart for about $5, and return it the next day, if you have no further use for it.

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