Request you to please disconnect the cables from the motherboard, hard drive, CD/DVD drive and ensure that it is reseated firmly. Reseat the memory modules and set the BIOS back to defaults. Refer to this link http://dell.to/1MKI0Pf for the manual. Please reply if you have any further questions.
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Forum Post: RE: Dell Dimension 5150 not booting LED's 123 on logo+progress bar stuck at 5% no beeps
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