Apple Hardware Test (Extended) (Trustable???)

Hi everyone, I have encountered a problem for quite a long time and that is the boot-up time is slower than others and I have posted a few posts on different discussion boards (My iMac 3.06 GHz - 45-60 seconds) Others: 30-35 seconds
I finally executed the Apple Hardware Test (Extended) it took about 1.5 Hour and it said "PASSED" So does it mean I have (100%) no problem with my iMac although the boot-up time is still slower than others?

Hardware test only tests for known deviations from specifications at the time of the software's release. That said, it can capture issues with some bad RAM, but not all*:
http://www.macmaps.com/badram.html
Slow boot time is not something I'd run hardware test for. I'd run it for
1. kernel panics*:
http://www.macmaps.com/kernelpanic.html
2. odd behavior in the screen graphics which results in something more than a refresh issue, such as a scrambled screen. A scrollbar that is slightly offset the other can happen because of refresh issues with some programs that aren't optimized for the GPU and/or CPU or operating system. A pixelated square which follows the cursor often can be a GPU issue.
3. Freezes which can't be explained by non-Apple hardware, non-Apple software, or Apple software that is not in the range of specs of the current machine.
4. Sudden system shutdowns not caused by Energy Saver settings, or user induced shutdowns.
5. Issues not occuring because of insufficient disk space*:
http://www.macmaps.com/diskfull.html
6. Or issues not occuring because of a bad directory or permissions*:
http://www.macmaps.com/directoryfaq.html
7. Issues which don't go away with an erase and install of a supported operating system, and known compatible hardware.
- * Links to my pages may give me compensation.

Similar Messages

Apple Hardware Test (Extended) not progressing

After upgrading my white MacBook (13-inch, mid 2010) from Snow Leopard to Lion, i was getting Kernel Panics, maximum of 5 min after startup. So i decided to downgrade back to Snow Leopard.
I erased my hard disk, tried to install SL from the DVD that came with the MacBook, i got a Kernel Panic. I tried it for 6 times, all with the same result.
I made the Apple Hardware Test, it passed.
Now i'm trying the Apple Harware Test (Extended), it's been almost 6hrs and here's the status:
Testing Memory
No error messages
Pass Number: 1
Time: stuck on 2hr 15min 49sec
Progress Bar: about 13%
However the mouse is still responsive. Is it normal for the test to take this long.
Thanks
PS: i tried the option-commant P R before running this test, and i dont have any peripheral connected

I have had endless issues with kernel panics since Lion. Rolling back to SL won't save you, because the last couple of updates to SL added in the cause of the panics:
Some combination of multitouch trackpad drivers and the graphics card drivers.
So, what I've done, and it seems to work better ( I can use this POS laptop for more than an hour now) is:
System prefs: turn off all the multouch stuff. All the gestures. Off.
Also, battery life is low because this os constantly writes to the hard drive and uses the network card. If you happen to push the system while you hear the fans spin up as it receives a push notification ...panic.
Spotlight has big problems with Lion. I stopped it from indexing almost everything, installed quicksilver, then turned off indexing on the drive. I uninstall flash unless I need it also.
kernel panics for me would always feature AppleHWSensor in the panic log.
60% triggered by me using the expose show desktop guesture. However, I assigned that to a keystroke... works fine.
I've lost 3 hard drives to this garbage, ( you can't keep on just turning off modern unix systems, via kernel panic)
Try what I suggested:
No Flash until you need it.
Turn off all the multitouch stuff in trackpad prefs
stop spotlight from indexing your logs, and Caches. Then turn it off.

Apple Hardware Test launches Open Firmware window

At work, I have a 2.3 GHz Dual-Core G5. When I run Apple Hardware Test [Extended], it generates an Open Firmware window in the lower-left corner at 11 minutes.
Has anyone else seen this?

I DID read the link - you should re-read my post. I have a G5 [the article refers to G4's] and a later version of AHT [which the article recommends updating to]. As soon as I removed the questionable RAM, the problem went away.

How do I run Extended Apple Hardware Test imac 21.5 mid-2010 mavericks

How do I run Extended Apple Hardware Test imac 21.5 mid-2010 mavericks? I have tried to start my computer holding down the "D" key but my iMac simply just restarts as normal.
I have checked the list of iMacs that can be upgraded to do an internet Extended Apple Hardware Test and I do not have one of those computers.
I cannot find any solution as yet.
I do not have the start up disks or the usb disks.

You can't run the hardware test without the installation discs.
Runaway applications can shorten battery runtime, affect performance, and increase heat and fan activity

Apple Hardware Test (Perform Extended Testing)

Hit the 'E' key to select Perform Extended Testing if you are unable to select it with a mouse.
I've been working on my wife's new iMac (I7 27") that she purchased a few months ago. Because it is so new, I wouldn't even waste my time on it and just sent it back to Apple to have them look at it (currently suffering slow startup times), however we recently moved overseas to Kyiv, Ukraine. During the troubleshooting, I found the following site:
http://support.apple.com/kb/ht1509
which informs users how to use Apple's Hardware test. Unfortunately, the app only recognized the wireless keyboard and not the wireless mouse. I didn't know who to contact to have the webpage updated because there is a way you can enable the extended hardware test from the keyboard (by hitting the 'E' key). Unfortunately, I had to figure this out on my own after exhaustive searching on the internet and websites. Hopefully, someone can pass this information along. I wish the app was more keyboard friendly.
I see some other posts that I haven't tried yet, so hopefully they might resolve me issue.
If I can't fix the problem, I'm going to have to see if there may be a rep in this country who to replace/fix the unit.
Kevin

Yesterday I ran the Apple Hardware test ( Version 3A181 - Perform Extended Testing ) from my MacBook OS Install DVD and Everything passed 100% ( entire test took 57 minutes and 15 seconds )
Forgot to mention after the Apple Hardware test was finished No Problems Were Found...
This isn't making any sense to me - Any Suggestions to what the cause of these Safe Boots may be ?

Apple Hardware Test, What is the Extended Test?

Hi. Using the Apple Hardware Test under disc 2 of the iMac's (late 2009) there's a checkbox for an extended test but it takes significantly longer compared to around 3 minutes only with a normal test. What does the extended test that the normal test have? Does it test more parts in the iMac?
Is there a third-party that's better than Apple Hardware Test that can test every bit of hardware in the iMac including it's power supply, internal battery charge, transistors, capacitors (if there are capacitors that are about to burst or are not delivering the proper voltage or current), if every pixek in the LCD is good, if the speakers are not torn, etc.
Gbu.

The extended AHT does a much more extensive set of tests on your RAM.
An alternative memory tester is Memtest which is a terminal command with Rember being a GUI layer for memtest.
There's also the diglloyd tools memorytester but it is not free.
AHT does video testing but I am not sure how extensive it is. And I'm pretty sure no utility exists to do component-level validation. Does such stuff like that exist for any piece of electronic equipment (TVs, radios)? That's what volt meters are for and possible test points on the pc boards.
I should add there are utilities like iStat Menus which are capable of displaying temperatures, volts, amps, watts of all many components of the hardware. But they just display the info, they aren't testing the stuff. It's up to the person looking at that info to decide if something is too hot, drawing too much current, etc.

Apple Hardware Test: Basic and Extended versions?

Does anyone know the difference between the Basic and Extended versions of the Apple Hardware Test? My MacBook Pro's logic board has been replaced, and now the Basic AHT reports no problems, but the Extended version crashes (stops, cursor freezes) when it gets to "Testing main logic board". I know the Extended test does a more thorough test of the memory, but apparently it does something different with the logic board as well. Anyone have any idea?

Well, thanks, that I knew, but was wondering if anyone could tell me just what "more comprehensive" consists of. Anyway, I think I've figured out at least one clue: I noticed that by the time the Extended test got to the logic board the fans were running pretty high, indicating that the computer was hot; and when I ran the Basic test right after, it crashed also. Conclusion: there is some component of the logic board that passes when cold, fails when hot. So the MacBook Pro has gone back to the repair shop, in hopes they can figure this out.

Can't boot off Apple Hardware Test disk

Can anyone suggest why my laptop won't boot off of its Apple Hardware Test disk anymore? I have not tried it in years, but want to try now. I have the original, and a copy I made years ago, and neither will boot. I can select them at startup disks in that preference pane in OSX, but then it fails to find it, and boots into OSX. I can boot into OS9 on the hard drive. I was able to partially boot off of a different AHT disk from my 12" Albook G4, but it gave the message that I can't use that disk since it is not meant for the Tibook. One idea is that TechTool tells me that "macintosh startup file was absent", and the Help file states:
"The Startup file is intended for use by systems that do not have built-in ROM support for booting from HFS Extended volumes. The first eight extents of the Startup File are stored in the Volume Header. This makes them easy to locate and read into memory. This file contains information used by the computer’s ROM to determine what program will boot the computer. In almost every case, this will be configured to point to the preferred System."
But it does not tell me how to restore this Startup file.
-how can i get my startup file back?
-my computer boots fine off the hard drive, so is this file used only to boot off a CD?
-any ideas why i can't boot off my AHT CD?

Hi, t. (That alias of yours sure is a mouthful.) I think in your shoes I would pose the question to the tech support people at Micromat (TechTool's developer). It's their error message, after all, and they should be able to explain it to you in as much detail as you need. Perhaps they'll shed some light on the original problem in the process.

G4 that will not boot from any disc EXCEPT the Apple Hardware Test CD

We have a DP 1ghz Quicksilver PowerMac G4 that will not boot from any disc EXCEPT the Apple Hardware Test CD that came with the machine.
We were in the process of installing 10.4 Tiger before placing it for sale.
The Mac was originally OSX Server 10.1 that we later converted to a worksation running 10.3 Panther.
It has 1 GB of memory, 80GB hardrive, 250MB Zip Drive and a Radeon 7500 video card.
Since this machine only has a CD-R drive and not a DVD-R, we installed Tiger using another Mac via Target Disk Mode. The installation process went well, but when I tried to reboot I got a Kernel Panic right after startup screen with the grey Apple logo.
On some reboots we get to the blue startup screen, others it stops at the grey Apple logo, others a black box like the a Kernel Panic - but with no text. Twice it went directly into Open Firmware.
We have done the following during our troubleshooting:
- Reseat RAM, Video Card, Hard Drive, Zip & CD-R connections
- Remove RAM 1 stick at a time and reboot
- Replace RAM with RAM from another working Quicksilver
- Replace Video Card with one from another working Quicksilver
- Zap PRAM
- Reset CUDA switch
- Unplug the MAC and remove everything (RAM, Battery, etc) for 30 minutes and try to reboot
- Tried booting from the Macintosh Server G4 Software Restore CD
- Tried booting from Mac OS X Server CD
- Tried booting from AppleCare Protection Plan CD with TechTool
- Tried booting from Diskwarrior CD
- Tried booting from an external FireWire drive with a disk image of Tiger OS Install
- Tried booting with the hard drive disconnected
The Mac WILL boot from the Apple Hardware Test CD and will pass ALL of the extended tests.

Conventional wisdom says that any Mac that will not boot up from a System/Install CD OS 9 or an Install CD Mac OS X, has a Hardware problem.
The diagnostic CD is a red herring because it uses a very primitive method of reading the CD, and so does not properly represent the machines general ability to read CDs.
I would look at the CD drive cables, etc, and see if another drive gives different results.
You have not mentioned using the Startup Manager (option key at Startup) to do any checking:
HT1310- Startup Manager: How to select a startup volume

How do I run Apple Hardware Test on a 2012 MacBook Air with 10.8.4?

Hello everyone,
I am trying to run Apple Hardware Test on a mid-2012 MacBook Air with 10.8.4 installed. Whenever I restart and hold the letter D my computer goes into internet recovery mode and asks me to connect to Wifi... Please help, thanks!

Using Apple Hardware Test on computers with OS X 10.7 or later
Mac NoteBook and Desktop computers shipping with OS X 10.7 or later have a partition on the hard drive or flash storage that contains AHT. To start AHT on these computers please follow these instructions:
Press the power button to turn on your computer.
Press and hold the D key before the gray startup screen appears.
It takes a minute or so for AHT to start up and inspect your hardware configuration. While this is taking place, an icon appears on the screen:
When the process is complete, select your language and click the right arrow. If you aren't using a mouse, you can use the up and down arrows to select a language and then press the Return key.
The AHT console appears. You can choose which sort of test or tests to perform:
To perform all of the basic tests, click the Test button or press the "T" key or the Return key.
To perform a more thorough diagnostic test, select the "Perform extended testing" checkbox under the Test button before you click the Test button.
Note: Your test results will appear in the window in the bottom-right of the console.To exit AHT, click Restart or Shut Down at the bottom of the window.
Some Macintosh computers that shipped with OS X Lion and later support the use of Apple Hardware Test over the Internet. These computers will start up to an Internet-based version of AHT if the hard drive does not contain AHT. An Internet-enabled connection via Ethernet or Wi-Fi is required to use this feature. Internet-based AHT functions the same as AHT on the hard drive or flash storage outlined above.
The Mac NoteBook and Desktop computers listed in Computers that can be upgraded to use OS X Internet Recovery will require a firmware in order to support the Internet version of AHT. Without this update you may see the behavior discussed in this article.
http://support.apple.com/kb/HT1509

Apple Hardware Test error 4SNS/1/40000001:ID0R-0.000 on Retina MBP

Getting the above error on my 3-day old retina MBP with 16gb RAM and 768GB flash storage. I had loaded Chrome, Firefox, VMWare Fusion, Office 2011, and all the Apple updates as of 7/3/12.
My issue may be related to similar issues I've seen on these boards, relating to sleep or wakeup causing the intermittent crash. Machine has also crashed (kernel panic) 2 times. Genius Bar employee downplayed the AHT altogether, saying it's a false positive since his more advanced tool reported no errors. They then kept it for a day, to run a "loop test," which also came back with no errors. Then, because apparently it is easier to re-load the OS rather than actually diagnose the issue, they re-loaded my OS clean. (Yay, now I can re-load all my apps, copy 200GB data back on, and THEN we'll see that it is a hardware problem.)
Tomorrow I'll pick it up from Apple and run the AHT again. If it errors out again, I'm not sure what to do...

One note I had neglected to mention is that the bar/band immediately above the keyboard gets very, very hot. Yes, I know that is where the fans are. However, all 12 of the MBP's at the Apple store did not have this extra-hot band, and those are on all day. My little Safari & Mail apps should not cause an overheat situation, on a functioning machine. Apple blamed Google Chrome for the crashes, downplayed the overheating, and downplayed the AHT results.
Update: I went to the Apple store today and took a look at the notebook. They ran their tests, had re-loaded the OS, and performed an undisclosed hardware repair. (They were helpful but vague as to what the actually did on the machine, hardware-wise.) They said their advanced tools & extended Loop Test did not indicate any errors or problems. While still at the store, I ran another quick test with the Apple Hardware Test, which came back with the same 4SNS error as mentioned above. I asked for a refund, which they approved (except they said I have to come back Monday since I bought the machine from Apple Business.)
When I got home, I ran an extended test with the Apple Hardware Test and got a *diffferent* error this time: 4HDD/11/40000000:SATA(0,0).
It's seems strange to me that the AHT shows 2 different errors, and yet the Genius' "advanced " tools find no errors. Thankfully, I will return this one (eventually) get a new unit. Thanks to everyone for helping. --Peter

Disk repair and Apple Hardware Test says HD has no problem but grey screen still persists on MBP

5 days ago while on vacation, my MBP just froze with the grey screen, apple logo and spinning gear.
I performed all that was instructed on the following discussions:
http://support.apple.com/kb/TS2570
except Archive and Install installation of MAC OS X and Erase and Install MAC OS X since I was able to save my files in my husband's MBP via Firewire Target Disk Mode. At this point, I am still apprehensive in erasing my files and installing again the MAC OS X.
When I did the Disk Repair under the Disk utilities, it says that my Mac Os X is ok. (It also said ok when I did the fsck -fy when I till did not have my CD when I was on vacation)
I also tried the Apple Hardware Test (AHT) to further l test the hardware of my MBP and performed an extended checking and after an hour, its says that my HD has no problem.
Yet, after all these, when I restart my computer, it still has the grey screen with apple logo and spinning wheel!
Can anyone tell me what else can I do??? Appreciate any help!

I like the free demo of SuperDuper to make clones. It's free, Leopard and Snow ready and is easy to use. If you buy the full version you can do incremental backups.
You should use Disk Utility to do a Disk Repair, as shown in this link, booted up on your install disk, before you make a clone of it. I use DiskWarrior for that instead.
I then partition my external disk, in Disk Utility, with a partition that is the same size , actually a tad bigger, as my system disk. I then use SuperDuper to clone my system disk over to that partition.
With a clone on an external FireWire drive (USB drives are not bootable on PPC Macs but are on some Intel Macs) you can bootup on it to do your repairs, on the main drive, or just run your Mac anytime you have trouble with your main drive.
That's why I like clones better then Time Machine. You can just bootup on them and use your Mac.
On the DiskWarrior thing, I use DW once a month to try and catch errors in my system from getting too far out of hand. It has repaired every little and big issue I have ever had with my three Macs.
And I have had times when Disk Utility's Disk Repair says everything's fine but my system was still having issues. Disk Utility, in my experience, cannot be totally relied on to find and report all issues. It just isn't robust enough.
I run DiskWarrior, it does find errors, repairs them and I'm back in business. I swear by it!
DALE

Can't get Apple Hardware Test to work

So I'm trying to run the Apple Hardware Test. I start the computer up and hold "D". It boots into OS X like a normal startup. So, I plug in the Ethernet and hold option-D to do the AHT from the Internet. It tells me "Apple Hardware Test does not support this machine".
So, I try to install the "iMac EFI Update 1.8" from http://support.apple.com/kb/DL1493 (which is for my iMac model, which is a iMac (Mid 2010)), but it says "This software is not supported on your system." I also tried the later version, v1.9, from http://support.apple.com/kb/DL1498 but it isn't for my iMac and so I get the same error.
So now I'm stuck. What should I do now?

Thanks that was it. It says AHT on the disk itself. I successfully ran it, and it found no problems ("No trouble found.") I ran the basic test only because I have 16 GB RAM, and so I imagine it would take a long time to run the extended—probably at least two hours? And I don't know what more that would find that the basic wouldn't?

Error 4PRC in Apple Hardware Test

Hello,
I have a 24" iMac (2.16GHz Core Duo, 1.5GB RAM) from late 2006. A few days ago, the display went black although the power stayed on. I turned it off, and it hasn't been able to boot since then. Whether I try to boot normally, in safe mode, or from the install DVD, the same thing happens: (1) happy startup sound with gray Apple logo; (2) that screen darkens and *sort of* a kernel panic message appears in the center. I say "sort of" because the kernel panic message's rectangle is in the right place and some of its text is readable, but partway down the rectangle it looks as though the drawing is offset somehow. Anyway, that's how this problem manifests itself: a kernel panic very early in the boot process.
Miraculously, the Apple Hardware Test starts up successfully from the install DVD. Both the normal test and the extended test give the same result: the RAM passes its tests, but when it reaches the CPU, the following error message appears, and the tests stop:
4PRC/1/40000003: Processor
That looks bad. I searched the web and various forums (including this one) and found very little information. An Apple document marked "Error Codes, Apple Hardware Test version 3A117" suggests that the appropriate action is to replace the processor.
I suspect that if I take the iMac to my local Mac repair specialists, they will offer to expensively replace the motherboard. I'm an old UNIX nerd and have tinkered with lots of machines other than Macs; can I simply replace my iMac's CPU myself?
Or is CPU replacement in fact unnecessary, when some other fix might work? Does anyone have specific advice about this error message?

In case it's helpful, here's a textual description of the panic from single user mode startup (which fails just as badly):
hi mem tramps at 0xffe00000
PAE enabled
64 bit mode enabled
standard timeslicing quantum is 10000 us
vmpagebootstrap: 382549 free pages
migtable_maxdispl = 71
Enabling XMM register save/restore and SSE/SSE2 opcodes
84 prelinked modules
ACPI CA 20060421
AppleIntelCPUPowerManagement: ready
AppleACPICPU: ProcessorApicId=0 LocalApicId=0 Enabled
AppleACPICPU: ProcessorApicId=1 LocalApicId=1 Enabled
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
using 7864 buffer headers and 4096 cluster IO buffer headers
Enabling XMM register save/restore and SSE/SSE2 opcodes
Started CPU 01
panic(cpu 1 caller 0x001A49CB): Unresolved kernel trap (CPU 1, Type 14=page fault), registers:
CR0: 0x8001003b, C5å: 0x19d0010c, CR3: 0x0120f000, CR4: 0x000006e0
EAX: 0x037a9198, EBX: 0x037de760, ECX: 0x0041fa40, EDX: 0x037ffc80
CR2: 0x19d0010c, EBP: 0x1cfb3e58, ESI: 0x0378bdc0, EDI: 0x037602c0
EFL: 0x00010212, EIP: 0x19d0010c, CS: 0x00000008, DS: 0x00000010
Debugger called: <panic>
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x1cfb3c38 : 0x128d0d (0x3cc65c 0x1cfb3c5c 0x131f95 0x0)
0x1cfb3c78 : 0x1a49cb (0x3d2a94 0x1 0xe 0x3d22b8)
0x1cfb3d88 : 0x19b3a4 (0x1cfb3da0 0x4b00d0 0x1cfb3dc8 0x4)
0x1cfb3e58 : 0x3c10b5 (0x37de760 0x378bdc0 0x1cfb3e88 0x389d2b)
0x1cfb3e88 : 0x38af5f (0x37de760 0x378bdc0 0x1cfb3eb8 0x38998b)
0x1cfb3eb8 : 0x38ed6e (0x3821f00 0x37602c0 0x37de764 0x3821f08)
0x1cfb3f38 : 0x38ebb5 (0x3821f00 0x37ffe40 0x0 0xffffffff)
0x1cfb3f88 : 0x3902fa (0x3821f00 0x0 0x134db9 0x390228)
0x1cfb3fc8 : 0x19b21c (0x380dd50 0x0 0x19e0b5 0x375c3b4) Backtrace terminated-invalid frame pointer 0x0
Kernel version:
Darwin Kernel Version 8.11.1: Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/RELEASE_I386

Will Apple Hardware Test definitely detect RAM errors?

Hello,
Been having various problems with Leopard/MacBook. Someone suggested running Apple Hardware Test, which I did, in extended + looping mode all night (it cycled 6 times). The test turned up nothing. Can I take this to mean that whatever problems I am having are definitely software related? I am not familiar with the AHT, don't know exactly what it does, nor how I can interpret a "clean" result...
Many thanks for any advice/tips.

No indeed (just "Colin" is fine...)
My problems have mostly been documented by other people, and I have just been monitoring the discussions on these issues.
Specifically (at the risk of getting off-topic):
1) inconsistent shared server behaviour: I have 3 other macs at home - an iBook and a G4 MiniMac running Tiger, and a G4 tower, also running Leopard - and most of the time, the tower doesn't show up at all, but I can connect to it via CMD-K, the MiniMac shows up in the sidebar, but won't let me connect, and the iBook, when it is running, behaves normally. Oh, screen sharing doesn't work either: it tries connect but hangs (except for the iBook, which works). I could connect to all four quite normally after upgrading to 10.5.0, using the sidebar icons. Everything worked fine until sometime after the 10.5.1 update, when suddenly everything went pear-shaped. Nothing has changed in the configs of the other machines, and the iBook and the MiniMac are identical in terms of software config (but behave differently as regards this problem?!?)
Closing Airport and reopening it makes the icons reappear in the sidebar (all of them, G4 tower included), as does relaunching the Finder, but doesn't change the behaviour: I still can't connect. When I try to use the sidebar icon for the tower, it disappears (the icon...)
As far as I can tell, trying to operate shares from the G4 tower works as Apple intended (although I admit I have not exhaustively tested every option, as I don't have unlimited time...)
2) Lost my printer connections, both at work and at home. I managed to reestablish them at work, but I tried so many things that finally I'm not sure what actually worked. No dice at home (shared printer on the MiniMac... same problem as (1) I guess.)
3) the dreaded Keynote spontaneous reboot problem (I placed a reply about that last night here:
http://discussions.apple.com/message.jspa?messageID=6630702#6630702
4) diverse weird things, like
4a)iCal which had doubled all my events the last time I opened it. I had to manually delete one copy of every event I had entered, whereas I made these entries several weeks ago, and had consulted them many times... I'm thinking this is perhaps a result of the brutal reboots caused by (3)? Having deleted all the doubles, iCal seems to be behaving normally again.
4b)screen resolutions on my slave screen suddenly failing to select properly. I move my MacBook between two different external monitors, one at work, one at home, and their resolutions are different. Initially the MacBook had no trouble detecting and correctly setting the resolutions for the two screens, then suddenly my home screen went weird on me, and required a manual reset. Again, this was a once-off, and does not seem to be repeating (yet).
4c)sluggish performance with some apps that are normally quite snappy, like Firefox, which seems to hang a lot loading pages, Keynote (saving is often painfully slow), and indeed, trying to copy a 250Mb file from the tower to the MacBook via Airport (having connected using CMD-K) said it was going to take 33 hrs, which I thought was a bit rich...
4d) hot-swapping a usb pin for a keyboard+optical mouse receiver from the tower to the MacBook sometimes causes something inexplicable to happen to the MacBook's keyboard: both the Caps and the NumLock LEDs come on, and the keyboard has jumped into some config other than what it is normally in (French). I have not been able to determine what the keyboard actually thinks it is when this occurs (3 times now). The command keys (ctrl, alt, cmd) do not appear to work at all. Rebooting corrects it.
All up, pretty irritating, and a huge time waster, as you can well imagine. I stuck a bit of a rant on the discussions the other day in a moment of intense frustration, which got zapped by the moderators (probably not unreasonably!), but not before someone replied suggesting that it might be bad RAM, hence my questions here.

Apple Hardware Test (Extended) (Trustable???)

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