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There are many reasons this can be happening. Try starting the computer in Safe Mode with Networking and see if the problem still exists. If not that means there's a problem with the start up boot process. Questions to consider: How old is the machine? Have you done all your updates? Possible virus. What exactly does the Blue Screen read? Is it a quick blue screen then restarts or does the blue screen stays? We are computer service company that offers remote free diagnosis. Call us to today at (877)608-4574 or visit us at www.aplusonsite.org.
Hello! "blue screen" means: picture is all blue, but there is a signal coming through? Do you see channel logo? Menu? If so, blue CRT or CRT board is at fault. Depends on the age of the set. If set is fairly new, then try to bang on the neck of blue tube with rubber screwdriver hands. Very gentle! While set is working. If you see the retrace lines and TV shuts down then, CRT is at fault. If not, try to play with blue "screen" control of "focus block". Black plastic module with bunch of thick wires attachad to that. Has 3 "focus" and 3 "screen" controls. For each of the tubes. In many cases you'll be able to adjust "blue" down to normal. Usually, those controls are smeared with white paint and hard to turn by hand. Loosen those with little pliers, then adjust manually or via small "phillips" screwdriver. If nothing helps: CRT board is at fault and must be replaced or repaired. In this case you won't see any characters on blue CRT, just solid "blue". good luck, Alex.