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Can check if the battery is low ... or is not (or cannot) holding a good charge ... when you unplug it (from the charger) ... when this happens ?
If that is the case, it may "freeze" while it is busy trying to store the contents of your memory before it shuts down (or hibernates). Does it shut down (or goes into hibernate if you let it continue to "freeze") for a while ? If so, then it's your battery.
If the battery doesn't hold a good charge, the laptop will run only a short time (while unplugged) before it has to shut down due to low battery. And if this is the case, consider getting a replacement (new) battery. And follow the initial charging instructions (for a new battery) to lengthen the life of the battery.
any 18-20 volt laptop charger should work only need correct power plug and that can be easily changed if necessary with soldering iron and volt meter. using old charger plug as replacement. volt meter is used to check out correct polarity of plug before and after you re solder plug on.generally outside is -ve and center is +ve ,alternatively go to ebay or google and type in Sony Vaio PCG 7Q1M charger,or type in part number ,or try 18-20v laptop charger, that is what I do when I need a replacement charger,cost around $10 delivered usually.
fix first the power adapter/ it not charging some problem of your power adpater,, check the charger if it is working properly or not, then follow by dc connector should know that your dc connector has no deffect// if its okay check the motherbaord of your pc maybe som chips need to replace or damage...ic capacitor fause..ech..
It could be many things including the mother board, but it could also be something much more simple. When a processor overheats (big problem on alot of laptops) the laptop automatically shuts off, and sometimes does not come back on for a while. You shoudl try to unplug it, and take out the battery for a while, and try turning it on WITHOUT the battery in.
Do you get the same result if its plugged in or running off battery? Try holding down the "FN" key or function key and using one of the Function keys i believe its F6 on the sony's to brighten up your screen if that doesn't work try downloading and reinstalling your video driver and finally you may have a video card issue