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| Thread ID: 126726 | 2012-09-15 03:31:00 | Computer wont boot after power surge | antares (16890) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 1301078 | 2012-09-18 23:41:00 | :lol: | KarameaDave (15222) | ||
| 1301079 | 2012-09-19 00:21:00 | Seems my friend you have a habit of really annoying hundreds of people I already said why. I challenge widely believed urban myths. Do so with facts and numbers. And bluntly define the myth. Facts with numbers often makes angry the person most easily manipualted by advertising or hearsay. Numbers, for some reason, particularly make many emotional. Many just hate to learn how easily myths manipulate them. Their replies reflect their emotions rather than their curiousity. A perfect example is in this thread. Damage exists; so it must be a surge. Or power loss causes electronics failure. Or a sudden power loss can harm a disk drive. Or power restoration causes a higher than normal voltage. Or profanity describes Dell and HP products. None were true or justified by facts. And yet many believe those myths. You even posted a classic myth. That an AC mains surge will blow through a supply to cause 12 VDC damage. Power supplies routinely have protection rated at thousands of volts. And numerous other layers that makes that damage all but impossible. Destructive surges typically bypass superior protection inside a supply to get into DC voltages. But irrelevant to the OP's problem. You correctly noted that recover programs do not come with bootdisk.com. Of course. But that missed the point. Find a problem before trying to fix (recover from ) it. You also accurately noted that brownouts do not cause electronics damage. Many believe otherwise. You demonstrated how to know when a surge existed. You recovered data from a drive after a computer tech just 'knew' (using speculaton) that all data was totally destroyed. Although you do not say it, I suspect you understand why shotgunning can even complicate a solution. As I said, I do not bother with obvious stuff. Many get angry to learn that power cycling does not cause premature incandescant bulb failure. Many become angry rather than learn why that is a classic urban myth. Human nature was even many 'knowing' Saddam had WMDs. Knowledge despite facts and numbers that obviously said otherwise. Too many only believe the first thing told rather than do what is required to have knowledge. They get angry rather than learn. Emotional tirades are common when exposing widely believed urban myths. But that is what I do. Posting about what I know best often makes many angry because it contracts the first thing they heard. Did you know smoking cigarettes increases health? A majority in the 1950s 'knew' that was true. Then got angry at the Surgeon General for exposing a widely believed myth. Anger is routine with many who use junk science reasoning and who automatically believe the first thing told. I said I routinely challenge popular urban myths with hard facts and numbers. As you noticed, it makes so many so angry. Meanwhile, OP's solution was recommended multiple times. |
westom (16792) | ||
| 1301080 | 2012-09-19 00:40:00 | Worst case scenario - Power Surge takes out the power Supply . Computer components work on 12V and below . A PSU is basically a transformer dropping down the voltage, if that fails you can get 240V into 12 V components, a person doesn't need to be to good at maths to figure out, instant blowup of components . Close, but not quite right, the 230 volt feed is fully isolated from the output and no surge short of a direct hit by lightning can bridge that divide . What does happen is that the spike or surge on the 240 volt input can be quite massive, up to 1000 volts or more, so in very simple terms, and ignoring a lot of technical electronic and transformer guff, this momentarily transforms a 12 volt line to say 48 volts . Depending on the rating of the regulating electronics on the low voltage lines, that increased output can then fry lower rated ICs and transistors and a catastrophic failure usually follows . I have never seen 240 volts break over to the low voltage secondary of any device except through overheated insulation failure, but fair do's, it could happen in some cases where an arc opens up a low impedance path then the lower voltage is carried over it, in the same general manner that a lightning strike is preceded by an ionised leader that heads toward the ground and as it approaches it is met by an upward leader (makes your hair stand on end) . When the two meet, an ionised path is completed and the main strike current discharges down that open ionised channel to the ground, hopefully eliminating the neighbour's yappy poodle in the process . Cheers Billy 8-{) |
Billy T (70) | ||
| 1301081 | 2012-09-19 01:00:00 | What does happen is that the spike or surge on the 240 volt input can be quite massive, up to 1000 volts or more, so in very simple terms, and ignoring a lot of technical electronic and transformer guff, this momentarily transforms a 12 volt line to say 48 volts. What happens to voltages inside your laptop when AC mains vary between 85 volts and 265 volts? Nothing. Every laptop must supply constant and stable internal DC voltages when AC mains vary that much or more. (And an example of why rumored UPS voltage regulation has little useful purpose.) Either voltage is too low; so electronics simply power off. Or voltages vary that much; normal operation. Or voltages exceed 1000 volts to maybe cause damage. Electronics are that robust. Unknown to most. But then some of this is obvious by simply reading the manufacturer's spec numbers provided with each appliance. Numbers that too many ignore to entertain hearsay or fears. Major voltage changes on AC mains must cause no voltage variation inside that laptop. These numbers also say why AC mains variations would be irrelvant to the OP's problem. (6146B - I don't remember that one. What was it - a pentode or a power amp?) |
westom (16792) | ||
| 1301082 | 2012-09-19 03:05:00 | @Wainui, check out this post by westom www.tech-archive.net Sound familiar? I note that there appears to be a user on that forum called Antares 531 (similar to the OPs username) as well! www.tech-archive.net Not a great believer in co-incidences like that! May be a troll like being. |
KarameaDave (15222) | ||
| 1301083 | 2012-09-19 03:11:00 | Now all we need to do is wait for the ban to happen lol. | Nick G (16709) | ||
| 1301084 | 2012-09-19 04:00:00 | @Wainui, check out this post by westom www.tech-archive.net Sound familiar? I note that there appears to be a user on that forum called Antares 531 (similar to the OPs username) as well! www.tech-archive.net Not a great believer in co-incidences like that! May be a troll like being. Could be :D Just one thing about a power related problem, what ever the cause or reasoning. The average person who wants their computer fixed when it fails, doesn't care in the slightest as to why it broke, they only want it going again. |
wainuitech (129) | ||
| 1301085 | 2012-09-19 05:36:00 | Westom, I'm only going to say one thing. Thanks very much for an entertaining couple of days.:thumbs: Early on you manged to show true colours. You want FACTS - try these ;) I did a google search of your login name westom the first result listed I just about fell off the chair laughing. 4256 Upon opening it, read it and had a chuckle, back clicked, and the option to expand out the get more discussion results appears. Looked at the previews, and opened a few, read what OTHERS have been saying. Seems my friend you have a habit of really annoying hundreds of people all over the world on several forums, many say the same thing ---- well have a read PF1 members - a warning though - theres plenty of laughs in what others say. :D As any layman (as you put it), the westom in those threads is the same person here and anyone can see Its the same MO all over the world, tries to be a know it, and cant actually back it up. Thanks -- good laugh for the week :) Not surprising... |
ChazTheGeek (16619) | ||
| 1301086 | 2012-09-19 06:39:00 | ubuntuforums.org More here. He has an email address as westom1@ wiseplan.tk Maybe the same person. :) |
Trev (427) | ||
| 1301087 | 2012-09-19 09:17:00 | Are you sure that's the Westom? | ChazTheGeek (16619) | ||
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