When hood is raised it will not stay up. What would cause this? on 2000 Ford Explorer

This started happening when the alternator went out. Since then it will not stay up.

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2 answers
Replace or have 'both' the hood lift/supports replaced. Avalilable at most parts stores. NAPA's part # BK 8195684
Thay loose pressure over the years and fail at 'any' given time.
hood lift shocks bad