Hello, needing help on a seagate external harddrive at first was beeping!! then plugged into a usb hub not bleeping!! but windows is recognising the device but its like the spindle not spinning almost like sleep mode [PDF] Momentus® 5400.3 SATA - Seagate
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The 'beeping' usually indicates that insufficient power is being supplied to the drive. Try plugging it in to the back and if there's 2 usb plugs, plug both in.
If it's not a power issue, then it sounds like a stiction fault (heads stuck to platters), or a seized spindle motor.