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HP Touchscreen 310 no video

I have someone who brought me a HP Touchscreen 310 all in one. When you power it up, the power button lights up and the fans come on but no video, it just stays black.  I opened it up and cleaned it all out of dirt. Also tried clearing cmos, reset memory and cpu as well as checked all connectors... I have read that it is common for the cpu to go bad and also for the solder to act up on the video card. some people used the oven method to redo the solder on the video card. I am iffy on trying that being its not my computer.  Is there anything i can do to narrow it down more? possible bad cpu, motherboard, video card? Any help would be great. It worked not long ago because i put a fresh copy of windows on it for them. It worked fine then.
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Nick Kline
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Nick Kline
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nobusCommented:
you can replace the motherboard -if that costs too much :

>>   I am iffy on trying that being its not my computer  <<  tell your customer it's the only and last thing you can try - and since it does not work, he looses nothing
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Nick KlineAuthor Commented:
The motherboard i found for about $110-$120 but i saw some people said they replaced the cpu and it worked fine. the cpu is only about $25 for this. so i was wondering if there is anything i can do to get a better idea if it might only be the cpu. hate to get the motherboard and then it not fix it. since there are so many variables.
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nobusCommented:
no - you can only replace it and test - they both work together - or not at all
chances are 95% motherboard, 5% cpu
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