System 7.5 MUK: Before You Install 7.5 Read Me

Before you install Macintosh system software version 7.5, read the important information below.

Disk First Aid and HD SC Setup

To ensure a smooth upgrade to system software version 7.5, make sure you use Disk First Aid to verify the hard disk and Apple HD SC Setup to update the hard disk before installing the system software. For instructions, see "Before You Install System 7.5" in the Macintosh System 7.5 Group Upgrade Handbook.

IMPORTANT If you are installing software on a PowerBook 150, Macintosh Quadra 630, or Macintosh LC 630, you should just run Disk First Aid to verify the hard disk. You do not need to update your hard disk.

RAM Disk

If you use a RAM disk, turn it off before you install system software version 7.5. When the RAM disk is active during software installation, it uses too much memory and prevents your system from starting up.

Quit All Applications

Before you begin installing system software, quit all applications.

Installation Time

Depending on your model of Macintosh, installation may take fifteen minutes to about an hour.

PowerBook 150 with Internal Modem

There is a compatibility problem with the PowerBook 150 with an internal modem and some communication software programs. We have included a fix for this problem in the Before You Install folder (inside the Installation folder). After you install System 7.5 on a PowerBook 150 with an internal modem, open the Before You Install folder, drag PB 150 Modem Patch to the System Folder icon, and then restart your computer.

Server or Network Programs

Any time you upgrade or re-install your Macintosh system software, you should also re-install your server or network programs, such as AppleShare or Apple Remote Access. For instructions, see the information that came with your server or network software.

Important If you have Workgroup Server 95, do not upgrade to system software version 7.5. Workgroup Server 95 works only with system software version 7.0.1 and System Update 3.0.

Possible Startup Problem on Quadra 900 & 950

After you install System 7.5 on a Macintosh Quadra 900 or 950, it is possible that you may encounter a problem starting up your computer. If you have trouble starting up your computer, do these steps to solve the problem:

1. Restart your computer while holding down the Shift key (to start up without extensions).

2. When the computer is ready, open your Extensions folder (inside the System Folder) and drag SCSI Manager 4.3 out of the Extensions folder.

3. Restart your computer again.

4. After you've started up successfully, if you need the functionality that SCSI Manager 4.3 provides move SCSI Manager 4.3 back to your Extensions folder and restart. Your computer should behave normally.