I've been wondering lately whether there's something wrong with either my memory, or my G5's memory. It's a 1st generation 2x2 GHz machine, and it came with 512 MB of RAM preinstalled. So I bought an extra two 512 MB DIMMS and installed when I set up the machine, making a total of 1.5 GB. But lately I've been seeing only 1 GB in the "About This Mac" window.
I did a memory test in Tech Tool Pro, it found two working 512 MB DIMMS.
So I figured the original two 256 DIMMS were fried, so I pulled the 512 ones and tried starting it up, which it did normally. I ran Tech Tool again with passing results:
I put the 512 MB DIMMS back in and tried starting up, but it went into Open Firmware. I typed mac-boot and got the question mark folder icon. I restarted and it booted, but without a chime. Same results as the first test. I'll try another reboot after I post this. Does anyone have an idea why I'm being cheated of 512 MB of RAM?
I did a memory test in Tech Tool Pro, it found two working 512 MB DIMMS.
Code:
Sunday, June 13, 2010 6:47:30 PM Europe/Stockholm
Passed
DIMM0: Empty
DIMM1: Empty
DIMM2: J13
Size: 512 MB
Type: DDR SDRAM
Speed: PC3200U-25330
DIMM3: J14
Size: 512 MB
Type: DDR SDRAM
Speed: PC3200U-25330
DIMM4: Empty
DIMM5: Empty
DIMM6: Empty
DIMM7: Empty
10101010 Check
This test works by writing the binary pattern 10101010 consecutively throughout the memory matrix, reading and verifying each pattern after it has been written.
01010101 Check
This test works by writing the binary pattern 01010101 consecutively throughout the memory matrix, reading and verifying each pattern after it has been written.
11110000 Check
This test works by writing the binary pattern 11110000 consecutively throughout the memory matrix, reading and verifying each pattern after it has been written.
00001111 Check
This test works by writing the binary pattern 00001111 consecutively throughout the memory matrix, reading and verifying each pattern after it has been written.
11111111 Check
This test works by writing the binary pattern 11111111 consecutively throughout the memory matrix, reading and verifying each pattern after it has been written.
00000000 Check
This test works by writing the binary pattern 00000000 consecutively throughout the memory matrix, reading and verifying each pattern after it has been written.
Passed
Code:
Sunday, June 13, 2010 7:07:30 PM Europe/Stockholm
Passed
DIMM0: J11
Size: 256 MB
Type: DDR SDRAM
Speed: PC3200U-30330
DIMM1: J12
Size: 256 MB
Type: DDR SDRAM
Speed: PC3200U-30330
DIMM2: Empty
DIMM3: Empty
DIMM4: Empty
DIMM5: Empty
DIMM6: Empty
DIMM7: Empty
10101010 Check
This test works by writing the binary pattern 10101010 consecutively throughout the memory matrix, reading and verifying each pattern after it has been written.
01010101 Check
This test works by writing the binary pattern 01010101 consecutively throughout the memory matrix, reading and verifying each pattern after it has been written.
11110000 Check
This test works by writing the binary pattern 11110000 consecutively throughout the memory matrix, reading and verifying each pattern after it has been written.
00001111 Check
This test works by writing the binary pattern 00001111 consecutively throughout the memory matrix, reading and verifying each pattern after it has been written.
11111111 Check
This test works by writing the binary pattern 11111111 consecutively throughout the memory matrix, reading and verifying each pattern after it has been written.
00000000 Check
This test works by writing the binary pattern 00000000 consecutively throughout the memory matrix, reading and verifying each pattern after it has been written.
Passed