We had a power spike that took out the power supply on our unit. Had the power supply replaced but, ever since then the unit thinks the Raid-5 drive has failed and begins to regenerate. When it finishes regenerating the Raid, after about 1/2 an hour (or so), everything freezes up on the device. The only way to get it going again is a hard boot which starts the whole process over again (Raid failed - regenerate - finish regeneration - freeze, etc. etc...)
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Unfortunately modern televisions and monitors are full of electronic semiconductors of which many are likely have got destroyed along with your original power supply during the storm. A nearby lightning strike will send high voltage spikes down aerial cables as well as through socket outlets. If you have contents insurance you should be able to claim for a new monitor.
Since the unit powers up and displays an error message it means that the power supply is working to some extent. The hard drive is probably malfunctioning and needs to be replaced. The DP-01 I have uses an 40 pin IDE 3.5" hard drive so finding a replacement should be easy unless it needs special formatting like TIVO drives.
As for the first solution - why do you think a PC hard drive needs -5v? The PC drive power connector has four pins - two grounds, 5v and 12v.
I did this on my PC. Took it to the shop (Harvey Norman). The techie reckons I got a spike across the terminals because I did not properly disconnect. He reformatted the drive for me. Unfortunately i lost everything on it (unrecoverable anyway he said). Worked fine till I got a problem with the transformer. Still working on that one. Know where to get a new transformer/power supply?
If the unit doesn't power on at all, no fan spinning and no power light, then it's either your power supply, and/or motherboard. Your hard drive could be damaged as well. You can find power supplies by googling tivo power supplies.
You may be better off sending out the unit for testing/repair. I recommend CCS in Indiana. Fast, and friendly service, used them many times. You will need to lose anything that was on the unit (settings, season passes and recordings) to ensure the drive is fully functional.
You may have a hardware problem of some sort. The first place I'd start is to check the power supply voltages. If one or more voltages is off tolerance, this will cause all sorts of symptoms. if you have a voltmeter check especially the +5, +3.3, +12, & +5 standby voltages. Use this site as a reference http://pinouts.ru/Power/atx_v2_pinout.shtml
If the supply checks out faulty, buy a replacement, or, if tech savvy, you might repair it-- probable component defects= one or more electrolytic capacitors.
Other possible problems are Memory errors (try subbing a RAM stick), hard drive developing errors, or a bad chip on the motherboard. If you have some spare parts, RAM, hard disk, you can try subbing parts and narrow down the problem.