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1. 3 long beeps usually indicates memory failure. Check memory compatibility here.
2. Check the following BIOS setting: Advanced => ATA Controller Configuration => SATA Mode. If it's set to Legacy, you can use only 4 SATA ports.In Legacy Mode, BIOS can enumerate only four drives. It provides four options to choose a mix of SATA and PATA drives (see Legacy IDE Channel option below). In Enhanced Mode, the BIOS is not limited to legacy PATA four drive limitations, and can enumerate the two PATA drivesand four SATA drives (totaling six drives) regardless of AHCI mode, and can list/boot to the remaining two SATA drives as well with AHCI Support. AHCI and RAID Modes are supported only when SATA Mode is selected as “Enhanced”.