20. Stay Safe

How can I tell if someone is using my Wi-Fi?

Elementary, my dear Wi-Fi user! The mystery’s solution lies in MAC (Media Access Control) addresses, which are unique codes that identify network devices. Different routers have different ways of showing which addresses (and thus, devices) are accessing your network. If you have an AirPort router, launch AirPort Utility from your Utilities folder, double-click your router’s icon, then click the Advanced icon in the resulting window. Click Logging and Statistics, then Logs and Statistics. In the Wireless Clients section, you’ll see a graph showing the address of each device connecting to your network. The list will include your Mac, the AirPort router itself, and any other computers, iPhones, game consoles, or other devices using your Wi-Fi connection. Next, match the MAC addresses to your network devices. We’ll get you started: your computer’s address can be found in the Network section of System Profiler. When you’re finished, you’ll know the addresses of devices you want on your network, so you can tell when something with a foreign address is using your Wi-Fi. Then the game’s afoot!

21. Sim-plify

I have a 1G iPhone that I want to use as a simple iPod touch, leaving aside the phone features entirely, but I don’t have the original SIM card. What are my options?

Your options are slim. Unlike later models, the 1G iPhone requires a SIM card to operate as a basic iPod, even after AT&T service has been terminated or transferred to another phone. You can get a new SIM card from AT&T, but this will require signing up for a new phone service contract. Unfortunately, there’s no way around this limitation besides jailbreaking your iPhone with one of the methods floating around on the internet.

22. Merge Partitions

Is there any way to un-partition a non-boot hard drive in OS 10.6 without wiping the data?

You’re in luck. Since 10.5, OS X’s Disk Utility has been able to add and remove partitions from disks without affecting other data on the drive. However, Disk Utility won’t merge data from the deleted partition to another partition on the drive, so back up all your data--especially files on the partition you’ll be removing--before you begin.

Once all your data’s securely backed up, launch Disk Utility from your Mac’s Utilities folder, then select the drive in the sidebar (be sure to choose the icon noting the drive’s capacity, not just its name). Click the Partition button, then in the shaded box showing the drive’s Volume Scheme, select the partition you want to remove. Click the minus button below the Volume Scheme chart to remove the partition (don’t worry, it won’t disappear right away). Click and drag other partitions to resize them and fill the empty space that will be left behind by the deleted partition. You can also click the plus button to add a new partition that can also be resized. Click Apply to commit your changes and begin Operation: Un-partition.

23. No Scratching

I just bought a new 21.5” iMac (late 2009 model) and found a serious design flaw: the CD slot has sharp aluminum edges that can inflict permanent, irreversible scratches to valuable CDs. Help!

These days, Apple’s really into razor-sharp edges. For example, the unibody MacBooks also famously have sharp edges where users rest their wrists, and those very same sharp edges have made it onto the slot on the side of the iMac where CDs are loaded. Luckily, those sharp edges are just on the outside, not on the internal drive itself. So if you carefully and slowly slide in your CD without touching the outside edges, you may avoid scratching your CD. But here’s a more practical solution: Put electrical tape around the edges of the slot. This isn’t the most beautiful thing to look at, but it’s almost guaranteed to keep scratches at bay. Another option would be to purchase an external CD drive to either use as your primary CD drive or to make copies of your valuable CDs. That way, if a CD gets scratched, at least it’s not the original.

24. Font Fixes

When using Mail, any font that I use in my outgoing email always shows up on recipient PCs as Courier--that archaic, typewriter style font. How can I get my Mac fonts to translate onto PCs?

In order for a font to be successfully seen on somebody’s computer, they need to already have that particular font installed on their machine. If your recipient doesn’t have the same exact font as you, their computer will substitute your font with a font that is already installed on their system. This applies to emails, websites, Word documents, almost anything. If maintaining the integrity of fonts is important to you, you’ll need to create PDF files or images and attach them to your outgoing email message.

25. App-Update Errors

When I try to update apps from my iPhone, I get a “Cannot Connect to iTunes Store” error, yet I have no problem downloading new apps, and no problem updating them in iTunes on my computer. What gives?

Assuming the problem is reoccurring and not a freaky networking accident, it sounds like your iPhone (or the problematic apps themselves) may be confused about the status of your iTunes account. This could be because a different user has logged into your iPhone, because you have multiple usernames or passwords tied to your iTunes account, or even because your billing information was recently changed on another device. The easiest place to start is by navigating to Settings, tapping Store, and confirming that yours is the currently active account on your iPhone. If it is, try signing out and signing back in with your most recent iTunes account information, then verify that your address and billing information are correct. If the problem persists, the apps may the culprit. Try updating them in iTunes, then deleting them from your iPhone. Reconnect your iPhone to your computer to sync the updated apps back to the phone. If, down the road, these same applications refuse to update from your iPhone again, deleting them from your Mac and re-downloading them from the iTunes Store may fix this.

26. Make Windows Behave

I have various finder windows set to appear in different views depending on their content. But certain windows stubbornly--and randomly--refuse to remember my preferences. Is it a bug, or am I missing a setting?

Setting a specific folder to open in a particular view (such as columns, icons, or lists) can make browsing files in the Finder a lot easier. Just open and set each folder to your preferred view, then select View > Show View Options in the menu bar and check the topmost button in the resulting window to force the Finder window to always open in that view. Unfortunately, the Finder has ignored these helpful preferences since the earliest days of OS X. Your stubborn folders aren’t the first!

Your folders may be confused by corrupt .DS_Store files, the invisible files created by the Finder to store icon sizes, window backgrounds, and more. System utility apps like TinkerTool and Cocktail can reveal or delete these files for you, or you can use the Terminal to delete them yourself if your UNIX Fu is strong.

If those options don’t do the trick, your Mac may think you don’t have permission to reset the view options of certain folders. Some, like the Applications folder, don’t technically “belong” to any user except the system itself, and only the system (also known as the root user) can make permanent changes to these directories. What looks like random stubbornness may be OS X remembering that it’s in charge of these folders, not you.

To show your Mac who’s boss, log in as the root user, then set uncooperative folders to the view setting you prefer. Just be careful, and remember to log back into your normal user account and disable root access when the job is done. Moving or deleting the wrong files while logged in as root can have serious consequences for your Mac. Apple explains how to log in as root here.

27. Just Open!

I used to double-click any photo, and it would open in Photoshop. When I installed 10.6, this feature disappeared. Now I have to drop the photos onto the Photoshop icon.

Snow Leopard ignores “creator codes,” which changed its file-opening behavior--it’s all about file extensions now. Right-click a JPG, choose Get Info, and under Open With, choose Photoshop, and click Change All. Do this again for PNG, PSD, TIF, and any other photo file types you want Photoshop to get first dibs on.

28. iPads Kill Wi-Fi

When enough of us use iPads on the office Wi-Fi, it can crash the Wi-Fi itself! I’ve heard this is a common problem--is there a fix?

You’ve heard right, and it’ll take an OS and/or firmware update from Apple to vanquish this annoying glitch. Until then, know that the issue is caused because an iPad can stop renewing its DHCP lease when it goes to sleep, so if you set your iPad to never sleep (Settings > General > Auto-Lock > Never), you’re good. That’s hardly ideal, and at Mac|Life HQ, we set up an iPad-only Wi-Fi network, which creates a smaller pool of DHCP leases and keeps the main Wi-Fi network safe. Interestingly, iPads are also prone to other Wi-Fi glitches, like sketchy signal strength, frequent drops, and slow speeds. Bizarrely, one of the first things you should do is increase the brightness upward and turn off the Auto Brightness option (Settings > Brightness & Wallpaper). We can only guess that something’s screwy with iPad power management…

29. Mac Pros Are Hot

I just wanted to bring to your attention a widespread, frustrating issue that exists with all 2009 Mac Pros. Whenever you play any audio, the CPU rapidly heats up (core temperatures as high as 90ºC, CPU heat sink 60ºC). This problem exists in 10.5 and 10.6, but does not happen in Windows running in Boot Camp, so it appears to be a Mac OS X bug. And after spending $8,000 on Apple’s top machine, I feel like I have been had.

Yes, this seems to be a prevalent problem with the 2009 Mac Pros. Playing any type of audio heats up the Pro precariously close to--but not quite at--dangerous heat levels. If your Mac actually reached dangerous heat levels, it would shut itself down. This increased heat also causes decreased performance. Unfortunately, we don’t have any solutions for you, but we’re publishing your letter in the hopes that greater publicity on this issue will help get a speedy resolution from Apple.

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