1-PC cannot maintain network connection!
I just want to discuss a particular network problem I encounter just recently, it's actually an additional connection to the router, the cable is just newly bought and crimped from the store.
The problem encountered is when you plugged the cable, network icon indicates a limited connectivity and shows an exclamation point. It took me sometime to trouble shoot the problem, but later I found out that CAT5 cable is not crimped based on standard configuration.
The hard part in identifying the problem is that LAN cable is newly purchased so it's the least you suspect.In case you encounter similar problem described above, try to inspect the connector visually or adjust network connection properties to 10 mbps full duplex(default setup is auto), if PC established network connectivity then it's confirmed that connector was not crimped in accordance to standards.
2-System restart when CD/DVD is inserted on the CD/DVD rom
Have you ever encounters a system that restarts whenever you insert a CD/DVD disk on its player? If not then this solution might help you solve the problem right away.
The situation is that the unit functions normally, except when you insert a disk on the player, at first you suspect that it’s a problematic OS, the CD/DVD player is problematic or the system is infected with a virus.
Before you spent hours in troubleshooting the problem, I suggest that you try replacing the power supply of your system, I have encounter a few problems of this kind that point to a problematic power supply unit(on other cases Windows hang-up or system keeps on resetting), especially if it is a not a branded one.
The explanation maybe to the problem, is that power supply unit cannot meet the needed current supply of the CD/DVD player, when it tries to initialize. That is why I mentioned on my other post regarding how valuable to spent a few bucks in purchasing a branded a power supply unit for your CPU
3-A power supply problem!
Sometimes Power Supply is sometimes overlooked when buying a new PC, and may cause headaches later in your PC computing.To give you and example, a year ago I encountered a problem that seems to point to a non-power supply related, but it turns out to be a power supply problem.
Here's the situation:
A customer calls me and complained that his unit is not booting, so I went to his place and troubleshoot the unit,the first thing I did was turn off the PC, resocket the IDE cable and re-test the unit, upon testing everything works fine, so I tell him that maybe its just a matter of loose connection.
The next day he calls me again and said that the problem re-occur, so I went back again and check the unit all over again, I resocket the IDE connector again and re-test the unit, this time the hard drive is detected intermittently, so I suspect that its a harddisk problem.I even tell the customer that maybe your harddrive is ailing already.
I went to troubleshoot further, one thing I noticed during the troubleshooting process is that, there are times that the CPU unit, black's-out once in a while when harddrive is connected,but if you don't connect the harddrive, everything's fine.
Its really a very confusing problem, you can mistakingly point to a defective harddrive.Luckily I have one spare harddrive with me, so I install it on his unit,but problem still exist.
With that I now started to suspect the PS unit, so I disassemble it and check its internal components, and I found out that there are lots of bulging filter capacitors in its circuitry, which convince me that its the one that's causing the whole thing.
I tell the customer that it must be the PS unit that's causing the problem and it should be replaced.After replacing the PS unit, everythings works fine.By the way, the PS unit he is using is the generic one's(normally bundled on a new PC casing).
Generic PS unit are a little cheaper that the branded one's but if you compare its performance its difinetely worth the extra bucks you add in purchasing a branded PS unit
4-Making difficult to remove viruses on one's PC!
In days where PC viruses are not that hard to remove, a free version on any anti virus product will fairly do the job well. But as hardware and software advances, so with this criminal who are developing viruses that is hard to detect, even with those paid versions of those popular anti virus software.
If you suspect that your PC is infected with a hard to detect unknown virus, and your not yet ready to reformat your hard drive, you can try the following method:
1. Remove your hard drive and full scan it on another virus free PC with updated virus definition.
2. Another method is to download a rescue disk on some popular anti virus product(Kaspersky, bitdefender, avira,Norton...etc,), you can google it and its free.
Method 2 is more comprehensive than method 1 but its more tedious.
The concept behind using a rescue disk is to create a bootable disk out of the downloaded image and use it to scan you system.In this case you can full scan your hard drive without booting at the infected system thereby preventing hard to detect viruses(rootkits) to load at startup.After downloading use Daemon tools or PowerISO software to create the bootable CD.
Take note, downloading and creating the rescue disk must be done on a clean and virus free PC
5-Viruses and Worms Sub-Category
A classic virus infiltrates into the system, it infects a file, activates in it, performs its malicious action and then adds copies of itself into other files.It reproduce only on the local resources of a certain computer, they cannot independently penetrate other computers. They can penetrate other computers only if it adds its copy into a file stored in a shared folder or on a CD or if the user forwards an e-mail messages with at infected attachment.
Code of a classic virus can penetrate various areas of a computer, operating system or application. Based on the environment, there is a distinction between file, boot, script and macro viruses.
Viruses can infect files using various methods. Overwriting viruses write their own code replacing the code of the file they infect and after they destroy the content of such file. The infected file stops working and cannot be disinfected. Parasitic viruses modify files leaving them fully or partially operating. Companion viruses do not modify files but create their duplicates. When such infected file is opened, its duplicate, that is the virus, will be run. There are also link viruses, (OBJ) viruses that infect object modules, viruses that infect compiler libraries (LIB), viruses that infect original text of programs, etc.
6-What is PHISHING?
Since the internet becomes so popular all around the world, an era of the so called cyber criminals was also born and until now it continue to mess on someone's online activities. In fact as individuals, banks, private establishments and government institutions relying more often and doing business via the internet, cyber criminals also grows its numbers.And inspite strict measures in certain countries to go after these criminals, still its not enough to stop these people from committing such crime. One cyber crime I would like to discuss in particular is called Phishing(in case you dont know).
Phishing is the act of sending an e-mail to a user falsely claiming to be an established legitimate enterprise in an attempt to scam the user into surrendering private information that will be used for identity theft. The e-mail directs the user to visit a Web site where they are asked to update personal information, such as passwords and credit card, social security, and bank account numbers, that the legitimate organization already has. The Web site, however, is bogus and set up only to steal the user’s information.
One example of this is my own experience, at one time I received an email from the admin of Yahoo(as to what I know that time) saying that congratulations you are one of those who win on our daily raffle worth $500 to claim the price please click on the link, if you still don't know what is phishing all about, you will really say that's the email is genuine and and you will jump to click on the link.After clicking the link it opens a site that resembles just like yahoo, and it will instruct you to further click on the link to claim you price via an e-currency company(if you have one, otherwise you will be obliged to open an account) and the last part just about you are finish transferring the $500, another message pops-up saying that you are not yet a premium member of Yahoo games and you have to register in order to claim your price, the cost is just a little over $8 so you will not suspect thats its a hoax, you will pay the said subcription price and found out later that no $500 goes to your account, and its just a work of a phisher but I thank God I only lost 8$. Phishers can steal password and user name to a site that you log-in regularly even in a Friendster or Yahoo mail account. Lots of E-bay members was also victimized by these phishers.
If you received an email, requiring you to upgrade your password, user name or something dont act on it, call or email the involve company to verify if it comes from them.Normally legitimate businesses will not let there members upgrade vital information via an email link, especially if password and user name are involve. You can also verify the given link on a domain verification site like http://www.whois.sc/ , in most cases it will give you the details of the particular link.
In IE7 there is already anti phishing features, while Opera and Firefox will warn you if the site you are about to open is not safe or bogus.
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