Could be a RAM issue, or graphics card. Try removing one of the RAM modules and see if that helps, if not, remove the other one. Also try swapping them and removing one again, could be a combination of bad module and bad slot.
If it’s a 13” MacBook Unibody (aluminium) then it could be the hard drive cable, they were prone to failure. Open it up and check the flat ribbon cable that goes from the hard drive to the motherboard for tears. Where the bracket holds the hard drive in place there should be a small cam gasket which spaces between the bracket and the bottom case, essentially pressing the bracket down slightly to keep the cable in place, otherwise it can flex and degrade over time. When the cable’s replaced, Apple supply this foam gasket (about 2cm long by 4mm wide) for the engineer to install if not present. Regards Sam <http://www.facebook.com/macambulance> <http://www.twitter.com/macambulance> <http://uk.linkedin.com/in/macambulance/> MacAmbulance Ltd. Providing Affordable Mac/PC Support and Web Development Sam Mullen ACMT +44 (0)7747778022 [email protected] <mailto:[email protected]> www.macambulance.co.uk <http://www.macambulance.co.uk/> MacAmbulance Ltd. is a registered company in England & Wales, registration number 8466597 This email is intended solely for the addressed recipients and may contain privileged or confidential information. If you have received this email in error please notify the sender and delete the email immediately. > On 13 Jul 2015, at 22:48, mac98aop <[email protected]> wrote: > > Dear all > > A while back my wife's Macbook HDD failed, and many of you pitched in > helpfully. I duly bought a new one, and installed it using a clone of mine to > get her up and running asap. It worked well, thanks again. But.... > > That put her on Mavericks, and for speed she was keen to have Snow Leopard > once more. So, tonight I erased the HDD, and rebooted with the original Snow > Leopard install DVD. All seemed to go fine, but it seems the install is > corrupted. It looks fine, but once you're logged in, after a few minutes it > won't load a web page, or a window or app you've asked it to. The pizza wheel > spins ad infinitum, and you can click and select other objects, but nothing > works. The only option is to long hold on the power button to force a > shutdown. > > I've rebooted from the DVD, and run Disk Utility > Repair Disk and Repair > Permissions. All seems fine. Except it isn't. It's unusable :( > > Now, in having chatted to my wife through the frustration, she's confirmed > that with Mavericks installed, it wasn't simply slow, but at times Safari and > system requests were occasionally unresponsive. The OS never froze though, > and she could simply select Restart from the Apple Menu to get up and running > again. That's no longer possible. > > Any thoughts? > > Do I clone Mavericks again and see if it works? > Could it be something other than the HDD that's causing the problem and for > some reason it plays a little better with Mavericks? > > Would really value any help. It's been such a great workhorse, but can't > think it's for the knackers yard yet! > > Adam > > > -- > You received this message because you are subscribed to the Google Groups > "Sussex Mac User Group" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To post to this group, send email to [email protected] > <mailto:[email protected]>. > Visit this group at http://groups.google.com/group/smug > <http://groups.google.com/group/smug>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- You received this message because you are subscribed to the Google Groups "Sussex Mac User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. Visit this group at http://groups.google.com/group/smug. For more options, visit https://groups.google.com/d/optout.
