Why When I Start My Pc It Doesn T Open And There Is An Underscore In T Custom Built Desktop Pc

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Jhon, as @verhulstak already mentioned, the computer needs the time and date set in the CMOS memory, and if I had to guess I’d say the CMOS checksum is probably wrong due to it being erased (or never set). Do as it asks and press F1, then set the correct time and date and make sure to do a save afterwards. If it continues to ask for that information after you’ve set it, then it’s likely the CMOS battery is dead or missing and will need to be replaced.