Ask Rick 298 01/03/14
I recently purchased a Samsung Galaxy
smartphone and want to buy a protective case for it for when I'm out and
about. Most of the cases I have seen
have a magnetic button to keep the phone securely inside the case. However, I
am concerned that it is not safe to have a magnet that close to the phone, and
have found conflicting advice online. Do you have any advice as to whether a
magnetic clasp would be safe?
Johanna Coulson, by email
It is not a problem, insofar as damaging your
smartphone is concerned, but a magnetic clasp could have other, unexpected
consequences. To begin with I would keep it well away from any credit or debit
cards with magnetic strips as it could erase or corrupt the data they contain.
Almost all smartphones and many tablets have a tiny built-in magnetic sensor;
some have two. The most common type is a magnetometer or Hall Effect device
that is used by compass apps to point the way towards magnetic North. The other
type, fitted to some Android tablets and Apple iPad 2 onwards, works in
conjunction with a tiny magnet embedded in the case. This turns off the display
and put it into sleep mode when the cover is closed. Clasp and case cover
magnets are generally quite weak but when bought in close proximity to the
phone or tablet may affect compass readings. So be warned, if you plan to use a
compass app for some serious navigation, remove the case and keep your device
well away from any magnets.
Chromebook Fails To Shine
My daughter has recently started a degree
course at the Open University. I have bought her a Samsung Chromebook to
support her studies. She now tells me that she is unable to download the zip
files from the OU containing her work, feedback etc. Although the OU has been
helpful they say that they only support certain operating systems, but not
Google Chromebook. Samsung technical services say it is all the fault of the OU
for using outdated technology.
Liz Lovering, by email
I am sorry to sound harsh but if you are buying
a computer for someone, always check that it will be suitable. This is vitally
important if it is going to be used for education or a specific application.
Schools, colleges and university IT departments are usually happy to advise and
this information is often on their websites. In the case of the OU it can be
found at http://goo.gl/8Zc4f5, which has
very clear guidelines. As a matter of interest Chromebooks, which use a variant
of the Linux operating system, can be persuaded to open and display the
contents of a .zip file, in a browser windows or by using the Google Docs
viewer. However, extracting a zip file can be tricky and requires additional
software or specialist knowledge, but in any event these fairly basic machines
have limited processor power and memory and are not really up to anything more
demanding than web browsing, emailing, simple document handling and multimedia
You recently answered a query regarding giving
PowerPoint presentations using a tablet computer connected to a digital
projector. I need to visit various
schools and hotels to give presentations using their equipment. I find that
most of them are still using older analogue projectors fitted with VGA video
and phono audio connections. Can a tablet be adapted to cope with this? I fear
it may be some time before much of this equipment is updated!
Peter Harrison, by email
Yes, it can be done, assuming that your chosen
tablet has an HDMI output socket. If so all you need is a HDMI to VGA cable
adaptor, which cost around £10 from online suppliers like Amazon and ebay. Just
make sure that you get one with the correct HDMI plug. Most tablet computers
are fitted with Micro (Type D) connectors, though a few models use the slightly
larger Type C socket. For the audio connection use a 3.5mm jack to phono lead.
I want to reinstall Windows on a computer but
the label on the case is too worn to able to read the product key. Is there any
way that I can find out what it is?
Yes, but this information is encrypted so you
will need help from a free utility called Belarc Advisor, which you can
download from: http://goo.gl/FcKC. Not only
will this decrypt and show your Windows Product key, and those of any other MS
products you might have, it reveals a vast amount of information about your
computer’s hardware and software, which it displays in a browser window. By the
way, be aware that you are only allowed to install a copy of Windows on one
computer at a time. Also, if you are using an OEM (Original Equipment
Manufacturer) version of Windows, supplied with a computer, it may not be
possible to install it on another machine, or you may run into difficulties
getting it activated.
I recently added another hard drive to my PC.
When I switch it on it on it goes for a few seconds and then shuts down. I have
not had this trouble before as I previously had a different second hard drive.
The computer is custom built by my son, but has been working fine for about 4
years. Could the problem be too many hard drives for the 500 watt power supply?
Philippa Mitchell, by email
This does not sound like a power supply problem
and my guess is that the computer cannot boot from the original ‘Master’ drive
because the power or data cable has come adrift, or the latter is connected to
the wrong socket on the motherboard. It should go to the one marked SATA 1. If
your system is using older EIDE type drives (fitted with a wide 40 pin socket),
the second drive should have a small ‘jumper’ connector on the back panel; make
sure that this is set to the ‘Slave’ position.
© R. Maybury 2014 1002