Why does my MacBook Pro and Mac Pro keep freezing?

Why does my MacBook Pro freeze?
MacBook Pro
2.4 GHz intel Core2 Duo
4BB 1067 MHz DDR3
OSX 10.6.8 Snow Leopard
I turned it on and I went to safari to look things up. Safari froze and then the whole thing became unresponsive - the mouse could move the cursor but it couldn't open any programmes.
Tried safe boot several times. No help.
Tried to repair disc permissions. The first time it got a little way then said 'user stopped repair' or something - though I didn't touch it. Tried again it got all the way through and said 'repairs complete'. But no help.
Couldn't clear cache etc as couldn't get to the relevant part to do it.
Opened in single user mode. Ran the fsck -fy thing twice. First time it said both “The volume appears to be OK” AND “FILE SYSTEM WAS MODIFIED.” In 2nd run it just said “The volume appears to be OK”. No help.
Booted it up from the Superduper bootable backup version on a USB external drive. It seemed to boot up ok but then tried to click on something and the same thing happened - spinning beach ball and it just hung.
Erased hard drive and reinstalled snow leopard but it just does the same thing. Suggesting a hardware issue not software but...the Eerie thing is, we tried backup version on boyfriends Mac Pro and it worked fine on there but 24hrs later his Mac Pro has got exactly the same screen freezing, unresponsive issue. Could this suggest there's something evil lurking on my back up? Can't get an appointment at Genius Bar until next week and need to get some work done, so hoping someone might have some ideas?
Cheers
Kerry

KaiDonald wrote:
... does Apple products work much better with using Apple routers?
While a genuine Apple router is likely to result in success, the reason for having one instead of another product is that it eliminates a lot of uncertainty. For example, we do not know the model D-Link product you have so no one is in position to speculate what the problem might be. Also, it makes support on this forum easier since there are only three AirPort models to choose from and they all work more or less the same.
Generally speaking your iPods, iPads, MacBooks, and AppleTV ought to work with any router though, provided it is fairly recent and meets accepted industry standards. If in doubt you can purchase an AirPort Base Station, which comes with 90 days of free telephone support. If it does not result in any improvement for you, you can always return it for a complete refund. The return period is 14 days and be sure to keep all material - receipt, box, manuals, etc...
If you elect this option be sure to follow its installation instructions, the most important of which is to power down your modem prior to connecting the AirPort Extreme, Express, or Time Capsule. All your other equipment will need their network settings adjusted to "forget" the D-Link network and connect to the new one.

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19/10/14 12.11.09,522 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:256
19/10/14 12.11.09,543 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:12856
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02/11/14 19.22.25,758 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:12342
02/11/14 19.22.25,900 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:34051
02/11/14 19.22.25,919 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:1901
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02/11/14 19.22.27,714 discoveryd[53]: Basic DNSResolver dropping message because it doesn't match the one sent Port:0 MsgID:28533
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I have seen by googling that it can be related to a sleep proxy problem so it seems like that here is two devices on the net with the same name that is why name is changing, but to know this do not help me to solve the problem. I have also seen all the suggestion to turn almost every services off on the computer, but again I it is not a solution and I have the iMac and devises to use the functionality not to shot everything down. So I do not really understand people saying turn off itunes, turn off blueboth, and turn off this and that.
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02/11/14 19.24.48,160 com.apple.xpc.launchd[1]: (com.apple.quicklook[1364]) Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.quicklook
02/11/14 19.24.52,279 Console[1368]: Failed to connect (_consoleX) outlet from (NSApplication) to (ConsoleX): missing setter or instance variable
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02/11/14 19.25.06,908 iTunes[480]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:5
02/11/14 19.25.06,908 iTunes[480]: tid:17d8b - Mux ID not found in mapping dictionary
02/11/14 19.25.06,908 iTunes[480]: tid:17d8b - Can't handle disconnect with invalid ecid
02/11/14 19.30.19,234 com.apple.usbmuxd[56]: _SendAttachNotification Device 30:f7:c5:30:b8:2b@fe80::32f7:c5ff:fe30:b82b._apple-mobdev2._tcp.local. has already appeared on interface 5. Suppressing duplicate attach notification.
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