Those beeps are POST codes:

• Repeating short beeps can indicate RAM issues; reseat or test modules.
• Long-short patterns often point to GPU or CPU problems.
• No beeps but fans spin may indicate motherboard or speaker issue.
• Check the motherboard manual for exact code meanings.

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What it might be (likely causes)

• Memory not detected / not seated
  Many boards signal RAM faults with repeating short beeps. Oxidized contacts or mismatched DIMMs can trigger this. Aging‑hardware context: /posts/top-problems-10-year-old-pcs/