1. what the bb sound like? bbb bbb bbb.... or B....B....B....
2. if bbb bbb bbb, 90% ram error,10% is motherboard problem, try unplug the RAM and clean the golden fingers on both side of it, then re-insert to ram slot to test.
3, if B...B...B..., 90% is the SVGA card problem, 10% is the motherboard problem, try replug the SVGA card or borrow any card from friend or neighbour to test la.
4. If tested both but still fail, you need to check the motherboard, should be the capacitors error and it brust! need replace mothboard.
5. all the above operation should be carried out after the PC has power off!