How to replace cmos battery on vaio vgn-cr510e? (and do I need to?)

You need correct driver to instal the software, try goggling the driver and please matching the driver and your device to avoid error.

For this kind of issue, you may try the following troubleshooting steps for confirmation:
1. Take the battery out of the laptop & try to turn on the laptop using power adapter only. If the computer turns on, then the battery is defective & needs to be replaced.
2. Make sure your vaio vgn-cr510e power adapter is not defective. Test the output voltage of the power adapter using a voltmeter. Compare the voltmeter reading to the nominal value written on the adapter or the laptop.
3. Make sure the DC jack is not loose or broken. A loose DC jack will need to be re-soldered. A broken one will need to be replaced.
4. If you have another processor which is compatible with your laptop's model, try swapping processors & test to see if the laptop will work.
5. The power button could be bad
6. The motherboard could be defective & needs to be replaced.

This WEB site may help you.
http://au.ask.com/web?q=laptop%20cmos%20battery&askid=1b8ace18-158b-4c2d-bce1-7a3fdba1cfff-0-au_gsb&kv=sdb&dqi=CMOS%20battery%20in%20a%20Sony%20Vaio%20VGN-FE790%20laptop&qsrc=999&o=3196&l=sem

Hello there,
Unfortunately your laptop does not have a HDMI out port. However, you can purchase a special cable like this one http://www.amazon.com/VGA-HDMI-Cable-6-feet/dp/B002TUC64W/ref=sr_1_1?ie=UTF8&qid=1304695016&sr=8-1 It will connect your monitor port to a HDMI device.
I hope this has helped! Thumbs up are much appreciated.

Either the cooling fan is not functioning properly or not functioning at all, or the heat sink's vents are blocked by dust & need to be cleared.
Another possibility could be that the thermal grease applied to the top surface of the CPU and/or the graphics chip has dried out & needs to be cleaned & new fresh thermal grease applied.

Unseat and reseat the lcd cable on the back of the LCD and to the motherboard.

Then see if that fixes the problem. If it doesn't then the lcd is going bad on you or the cable has a break in it somewhere so the cable would have to be replaced if that is the case.

We are talking about a standard keyboard and a standard computer??? Is it USB or something else?

Normally, I would expect to simply plug the keyboard into the appropriate port. You might have special software for special features on your keyboard. But even without the software, the standard keys should operate with nothing more than a plug in. The plug may be color coded to match the port.

Do you need more help ... Id like to help you. I need additional information to go forward.

Thanks

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There are several LCD screen parts suppliers on the Internet. I use this site for parts etc. www.lcdparts.net

Here is are disassemble instructions for you,

Good Luck