If a fault is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below. If you experience one of these beeps, you should call your Apple-authorized service provider for additional troubleshooting assistance.
1 beep = No RAM installed/detected
2 beeps = Incompatible RAM type installed (for example, EDO)
3 beeps = No RAM banks passed memory testing
4 beeps = Bad checksum for the remainder of the boot ROM
5 beeps = Bad checksum for the ROM boot block"
Please refer to Apple's article.
REFERENCE TO THIRD PARTIES AND THIRD PARTY WEB SITES. Seagate references third parties and third party products as an informational service only, it is not an endorsement or recommendation - implied or otherwise - of any of the listed companies. Seagate makes no warranty - implied or otherwise - regarding the performance or reliability of these companies or products. Each company listed is independent from Seagate and is not under the control of Seagate; therefore, Seagate accepts no responsibility for and disclaims any liability from the actions or products of the listed companies. You should make your own independent evaluation before conducting business with any company. To obtain product specifications and warranty information, please contact the respective vendor directly. There are links in this document that will permit you to connect to third-party web sites over which Seagate has no control. These links are provided for your convenience only and your use of them is at your own risk. Seagate makes no representations whatsoever about the content of any of these web sites. Seagate does not endorse or accept any responsibility for the content, or use, of any such web sites.