8 Krypton

Will not boot, persistent yellow light, Vostros 220

Vostros  220

replaced power unit with increased power unit about two years ago.

No issues until present problem

Very, very, dusty inside...cleaned it up

viewing a You Tube vid when suddenly monitor went black. Noticed yellow light on monitor indicating no vid feed. Then noticed yellow light on tower, not usual blue. Rebooted comp. One beep, persistent yellow light. Re-booted, no beep, comp re-booted itself, Could hear spinning (fan?) but no start-up, monitor remains black. Think there is a very faint beep initially...then nothing but spinning sound...

Opened comp, dusted, reseated RAM, HD connections, etc., all to no avail.

Would appreciate any suggestions as to possible root of problem. Thanks all.

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