From owner-freebsd-questions@freebsd.org Wed Aug 31 00:55:59 2016 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id A8432BBC68C for ; Wed, 31 Aug 2016 00:55:59 +0000 (UTC) (envelope-from dpchrist@holgerdanske.com) Received: from holgerdanske.com (holgerdanske.com [IPv6:2001:470:0:19b::b869:801b]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "*.he.net", Issuer "GeoTrust SSL CA - G4" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 995359D3 for ; Wed, 31 Aug 2016 00:55:59 +0000 (UTC) (envelope-from dpchrist@holgerdanske.com) Received: from ::ffff:99.100.19.101 ([99.100.19.101]) by holgerdanske.com for ; Tue, 30 Aug 2016 17:55:57 -0700 Subject: Re: Is it necessary to reinstall OS upon motherboard change? To: freebsd-questions@freebsd.org References: <20160830211757.7de1896d.freebsd@edvax.de> From: David Christensen X-Enigmail-Draft-Status: N1110 Message-ID: <2b6c40ab-0c1d-043d-977c-cc08bcfbea0c@holgerdanske.com> Date: Tue, 30 Aug 2016 17:55:57 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.2.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 31 Aug 2016 00:55:59 -0000 On 08/30/2016 02:21 PM, Manish Jain wrote: > I could not figure out any way to suppress all that noise that comes from > my system. Please describe the noise and/or upload an audio sample. > Upon opening the cabinet to investigate, all that I could make out > was that the noise originates from the motherboard. It's possible that > this motherboard uses lower grade capacitors and electronics, which could be > the root problem. ... To test if a fan is making noise, I place my finger on the center hub to stop the fan. (I then remove my finger after ~1 second and the fan starts again.) For power supplies, I typically shutdown the computer,open up the case, disconnect all the load pigtails, unplug the computer from AC power, place a known good power supply next to the case, connect its pigtails to the load, connect its AC power, and power up. To test for vibrating components, there are two approaches: 1. Touch components with something that absorbs vibration and/or increases mass (e.g. finger, pencil eraser, alligator clip, pliers, etc.). 2. Use a mechanic's stethoscope, or substitute (a solid rod, microphone and headphones), to determine what component is making the noise. David